90715311538 has 4 divisors (see below), whose sum is σ = 136072967310. Its totient is φ = 45357655768.

The previous prime is 90715311529. The next prime is 90715311571. The reversal of 90715311538 is 83511351709.

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., 46161811609 + 44553499929 = 214853^2 + 211077^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90715311494 and 90715311503.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22678827883 + ... + 22678827886.

Almost surely, 2^90715311538 is an apocalyptic number.

90715311538 is a deficient number, since it is larger than the sum of its proper divisors (45357655772).

90715311538 is a wasteful number, since it uses less digits than its factorization.

90715311538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45357655771.

The product of its (nonzero) digits is 113400, while the sum is 43.

The spelling of 90715311538 in words is "ninety billion, seven hundred fifteen million, three hundred eleven thousand, five hundred thirty-eight".