90311015978 has 4 divisors (see below), whose sum is σ = 135466523970. Its totient is φ = 45155507988.

The previous prime is 90311015929. The next prime is 90311015983. The reversal of 90311015978 is 87951011309.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 52701007489 + 37610008489 = 229567^2 + 193933^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22577753993 + ... + 22577753996.

Almost surely, 2^90311015978 is an apocalyptic number.

90311015978 is a deficient number, since it is larger than the sum of its proper divisors (45155507992).

90311015978 is a wasteful number, since it uses less digits than its factorization.

90311015978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45155507991.

The product of its (nonzero) digits is 68040, while the sum is 44.

The spelling of 90311015978 in words is "ninety billion, three hundred eleven million, fifteen thousand, nine hundred seventy-eight".