90571638 has 16 divisors (see below), whose sum is σ = 181944000. Its totient is φ = 30057096.

The previous prime is 90571601. The next prime is 90571721. The reversal of 90571638 is 83617509.

It is a super-2 number, since 2×90571638² = 16406443220006088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90571596 and 90571605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31888 + ... + 34611.

It is an arithmetic number, because the mean of its divisors is an integer number (11371500).

Almost surely, 2^90571638 is an apocalyptic number.

90571638 is an abundant number, since it is smaller than the sum of its proper divisors (91372362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90571638 is a wasteful number, since it uses less digits than its factorization.

90571638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66731.

The product of its (nonzero) digits is 45360, while the sum is 39.

The square root of 90571638 is about 9516.9132600860. The cubic root of 90571638 is about 449.0872660047.

The spelling of 90571638 in words is "ninety million, five hundred seventy-one thousand, six hundred thirty-eight".