99719980 has 48 divisors (see below), whose sum is σ = 228060000. Its totient is φ = 36481536.

The previous prime is 99719957. The next prime is 99719981. The reversal of 99719980 is 8991799.

It is a super-2 number, since 2×99719980² = 19888148822400800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (99719981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6496 + ... + 15544.

It is an arithmetic number, because the mean of its divisors is an integer number (4751250).

Almost surely, 2^99719980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99719980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114030000).

99719980 is an abundant number, since it is smaller than the sum of its proper divisors (128340020).

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

99719980 is a wasteful number, since it uses less digits than its factorization.

99719980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106 (or 9104 counting only the distinct ones).

The product of its (nonzero) digits is 367416, while the sum is 52.

The square root of 99719980 is about 9985.9891848529. The cubic root of 99719980 is about 463.7252324375.

The spelling of 99719980 in words is "ninety-nine million, seven hundred nineteen thousand, nine hundred eighty".