90270639 has 32 divisors (see below), whose sum is σ = 138776000. Its totient is φ = 57946752.

The previous prime is 90270637. The next prime is 90270679. The reversal of 90270639 is 93607209.

It is not a de Polignac number, because 90270639 - 2¹ = 90270637 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 (90270637) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108477 + ... + 109305.

It is an arithmetic number, because the mean of its divisors is an integer number (4336750).

Almost surely, 2^90270639 is an apocalyptic number.

90270639 is a deficient number, since it is larger than the sum of its proper divisors (48505361).

90270639 is a wasteful number, since it uses less digits than its factorization.

90270639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984 (or 978 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 90270639 is about 9501.0862010614. The cubic root of 90270639 is about 448.5892262160.

It can be divided in two parts, 90270 and 639, that added together give a palindrome (90909).

The spelling of 90270639 in words is "ninety million, two hundred seventy thousand, six hundred thirty-nine".