90537631 has 12 divisors (see below), whose sum is σ = 98787688. Its totient is φ = 82899072.

The previous prime is 90537619. The next prime is 90537673. The reversal of 90537631 is 13673509.

It is not a de Polignac number, because 90537631 - 2²¹ = 88440479 is a prime.

It is a super-2 number, since 2×90537631² = 16394125254184322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90537731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6460 + ... + 14926.

Almost surely, 2^90537631 is an apocalyptic number.

90537631 is a deficient number, since it is larger than the sum of its proper divisors (8250057).

90537631 is a wasteful number, since it uses less digits than its factorization.

90537631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538 (or 8521 counting only the distinct ones).

The product of its (nonzero) digits is 17010, while the sum is 34.

The square root of 90537631 is about 9515.1264311096. The cubic root of 90537631 is about 449.0310525925.

The spelling of 90537631 in words is "ninety million, five hundred thirty-seven thousand, six hundred thirty-one".