99115640 has 32 divisors (see below), whose sum is σ = 240166080. Its totient is φ = 36596352.

The previous prime is 99115631. The next prime is 99115663. The reversal of 99115640 is 4651199.

It is a self number, because there is not a number n which added to its sum of digits gives 99115640.

It is a congruent number.

It is an unprimeable number.

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, 94784 + ... + 95823.

It is an arithmetic number, because the mean of its divisors is an integer number (7505190).

Almost surely, 2^99115640 is an apocalyptic number.

It is an amenable number.

99115640 is an abundant number, since it is smaller than the sum of its proper divisors (141050440).

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

99115640 is a wasteful number, since it uses less digits than its factorization.

99115640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190631 (or 190627 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 35.

The square root of 99115640 is about 9955.6838037374. The cubic root of 99115640 is about 462.7865514238.

It can be divided in two parts, 9911 and 5640, that added together give a palindrome (15551).

The spelling of 99115640 in words is "ninety-nine million, one hundred fifteen thousand, six hundred forty".