90901556 has 12 divisors (see below), whose sum is σ = 159670980. Its totient is φ = 45281280.

The previous prime is 90901511. The next prime is 90901561. The reversal of 90901556 is 65510909.

It can be written as a sum of positive squares in 2 ways, for example, as 4708900 + 86192656 = 2170^2 + 9284^2 .

It is a super-2 number, since 2×90901556² = 16526185766442272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41165 + ... + 43316.

It is an arithmetic number, because the mean of its divisors is an integer number (13305915).

Almost surely, 2^90901556 is an apocalyptic number.

It is an amenable number.

90901556 is a deficient number, since it is larger than the sum of its proper divisors (68769424).

90901556 is a wasteful number, since it uses less digits than its factorization.

90901556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84754 (or 84752 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 35.

The square root of 90901556 is about 9534.2307503018. The cubic root of 90901556 is about 449.6318899063.

The spelling of 90901556 in words is "ninety million, nine hundred one thousand, five hundred fifty-six".