99420640 has 48 divisors (see below), whose sum is σ = 256238640. Its totient is φ = 36152320.

The previous prime is 99420623. The next prime is 99420649. The reversal of 99420640 is 4602499.

It is a junction number, because it is equal to n+sod(n) for n = 99420596 and 99420605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99420649) 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 7 ways as a sum of consecutive naturals, for example, 26485 + ... + 30004.

It is an arithmetic number, because the mean of its divisors is an integer number (5338305).

Almost surely, 2^99420640 is an apocalyptic number.

It is an amenable number.

99420640 is an abundant number, since it is smaller than the sum of its proper divisors (156818000).

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

99420640 is a wasteful number, since it uses less digits than its factorization.

99420640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56515 (or 56507 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 99420640 is about 9970.9899207651. The cubic root of 99420640 is about 463.2607630362.

The spelling of 99420640 in words is "ninety-nine million, four hundred twenty thousand, six hundred forty".