90171856 has 20 divisors (see below), whose sum is σ = 175044352. Its totient is φ = 44999136.

The previous prime is 90171841. The next prime is 90171869. The reversal of 90171856 is 65817109.

It is a super-2 number, since 2×90171856² = 16261927228969472, 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, 3601 + ... + 13903.

Almost surely, 2^90171856 is an apocalyptic number.

It is an amenable number.

90171856 is a deficient number, since it is larger than the sum of its proper divisors (84872496).

90171856 is a wasteful number, since it uses less digits than its factorization.

90171856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10858 (or 10852 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 90171856 is about 9495.8862672212. The cubic root of 90171856 is about 448.4255363617.

The spelling of 90171856 in words is "ninety million, one hundred seventy-one thousand, eight hundred fifty-six".