99623778 has 16 divisors (see below), whose sum is σ = 200251200. Its totient is φ = 33040656.

The previous prime is 99623759. The next prime is 99623779. The reversal of 99623778 is 87732699.

It is a self number, because there is not a number n which added to its sum of digits gives 99623778.

It is not an unprimeable number, because it can be changed into a prime (99623779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40525 + ... + 42912.

It is an arithmetic number, because the mean of its divisors is an integer number (12515700).

Almost surely, 2^99623778 is an apocalyptic number.

99623778 is an abundant number, since it is smaller than the sum of its proper divisors (100627422).

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

99623778 is a wasteful number, since it uses less digits than its factorization.

99623778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83641.

The product of its digits is 1143072, while the sum is 51.

The square root of 99623778 is about 9981.1711737651. The cubic root of 99623778 is about 463.5760625710.

The spelling of 99623778 in words is "ninety-nine million, six hundred twenty-three thousand, seven hundred seventy-eight".