90156399287 has 4 divisors (see below), whose sum is σ = 90193335936. Its totient is φ = 90119462640.

The previous prime is 90156399283. The next prime is 90156399313. The reversal of 90156399287 is 78299365109.

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

It is a cyclic number.

It is not a de Polignac number, because 90156399287 - 2² = 90156399283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90156399283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18464663 + ... + 18469544.

It is an arithmetic number, because the mean of its divisors is an integer number (22548333984).

Almost surely, 2^90156399287 is an apocalyptic number.

90156399287 is a deficient number, since it is larger than the sum of its proper divisors (36936649).

90156399287 is a wasteful number, since it uses less digits than its factorization.

90156399287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36936648.

The product of its (nonzero) digits is 7348320, while the sum is 59.

The spelling of 90156399287 in words is "ninety billion, one hundred fifty-six million, three hundred ninety-nine thousand, two hundred eighty-seven".