90730631 has 4 divisors (see below), whose sum is σ = 91879200. Its totient is φ = 89582064.

The previous prime is 90730603. The next prime is 90730639. The reversal of 90730631 is 13603709.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13603709 = 7 ⋅1943387.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90730631 is a prime.

It is a super-2 number, since 2×90730631² = 16464094803316322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 90730594 and 90730603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90730639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574166 + ... + 574323.

It is an arithmetic number, because the mean of its divisors is an integer number (22969800).

Almost surely, 2^90730631 is an apocalyptic number.

90730631 is a deficient number, since it is larger than the sum of its proper divisors (1148569).

90730631 is a wasteful number, since it uses less digits than its factorization.

90730631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148568.

The product of its (nonzero) digits is 3402, while the sum is 29.

The square root of 90730631 is about 9525.2627785274. The cubic root of 90730631 is about 449.3498941795.

The spelling of 90730631 in words is "ninety million, seven hundred thirty thousand, six hundred thirty-one".