90978728 has 16 divisors (see below), whose sum is σ = 170705760. Its totient is φ = 45457200.

The previous prime is 90978689. The next prime is 90978733. The reversal of 90978728 is 82787909.

It is a happy 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 3 ways as a sum of consecutive naturals, for example, 11543 + ... + 17753.

It is an arithmetic number, because the mean of its divisors is an integer number (10669110).

Almost surely, 2^90978728 is an apocalyptic number.

It is an amenable number.

90978728 is a deficient number, since it is larger than the sum of its proper divisors (79727032).

90978728 is a wasteful number, since it uses less digits than its factorization.

90978728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8048 (or 8044 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 50.

The square root of 90978728 is about 9538.2769932520. The cubic root of 90978728 is about 449.7590941002.

The spelling of 90978728 in words is "ninety million, nine hundred seventy-eight thousand, seven hundred twenty-eight".