90311639 has 16 divisors (see below), whose sum is σ = 103265280. Its totient is φ = 78180960.

The previous prime is 90311621. The next prime is 90311651. The reversal of 90311639 is 93611309.

It is not a de Polignac number, because 90311639 - 2¹⁶ = 90246103 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 (90311839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67394 + ... + 68720.

It is an arithmetic number, because the mean of its divisors is an integer number (6454080).

Almost surely, 2^90311639 is an apocalyptic number.

90311639 is a deficient number, since it is larger than the sum of its proper divisors (12953641).

90311639 is a wasteful number, since it uses less digits than its factorization.

90311639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its (nonzero) digits is 4374, while the sum is 32.

The square root of 90311639 is about 9503.2436041596. The cubic root of 90311639 is about 448.6571308144.

The spelling of 90311639 in words is "ninety million, three hundred eleven thousand, six hundred thirty-nine".