99422640 has 200 divisors, whose sum is σ = 351993840. Its totient is φ = 26002944.

The previous prime is 99422639. The next prime is 99422641. The reversal of 99422640 is 4622499.

99422640 is a `hidden beast` number, since 9 + 9 + 4 + 2 + 2 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (99422639) and next prime (99422641).

It is a super-2 number, since 2×99422640² = 19769722689139200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 99422595 and 99422604.

It is not an unprimeable number, because it can be changed into a prime (99422641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 434046 + ... + 434274.

Almost surely, 2^99422640 is an apocalyptic number.

99422640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99422640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (175996920).

99422640 is an abundant number, since it is smaller than the sum of its proper divisors (252571200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99422640 is a wasteful number, since it uses less digits than its factorization.

99422640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 99422640 is about 9971.0902112056. The cubic root of 99422640 is about 463.2638694177.

The spelling of 99422640 in words is "ninety-nine million, four hundred twenty-two thousand, six hundred forty".