99990756 has 18 divisors (see below), whose sum is σ = 252754502. Its totient is φ = 33330240.

The previous prime is 99990739. The next prime is 99990757. The reversal of 99990756 is 65709999.

It can be written as a sum of positive squares in only one way, i.e., 74649600 + 25341156 = 8640^2 + 5034^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (99990757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1388725 + ... + 1388796.

Almost surely, 2^99990756 is an apocalyptic number.

It is an amenable number.

99990756 is an abundant number, since it is smaller than the sum of its proper divisors (152763746).

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

99990756 is a wasteful number, since it uses less digits than its factorization.

99990756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777531 (or 2777526 counting only the distinct ones).

The product of its (nonzero) digits is 1377810, while the sum is 54.

The square root of 99990756 is about 9999.5377893181. The cubic root of 99990756 is about 464.1445806382.

The spelling of 99990756 in words is "ninety-nine million, nine hundred ninety thousand, seven hundred fifty-six".