99642880 has 40 divisors (see below), whose sum is σ = 238915512. Its totient is φ = 39856128.

The previous prime is 99642871. The next prime is 99642901. The reversal of 99642880 is 8824699.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 99642880.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16902 + ... + 22021.

Almost surely, 2^99642880 is an apocalyptic number.

It is an amenable number.

99642880 is an abundant number, since it is smaller than the sum of its proper divisors (139272632).

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

99642880 is an equidigital number, since it uses as much as digits as its factorization.

99642880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38946 (or 38930 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 46.

The square root of 99642880 is about 9982.1280296338. The cubic root of 99642880 is about 463.6056895811.

The spelling of 99642880 in words is "ninety-nine million, six hundred forty-two thousand, eight hundred eighty".