90881731 has 8 divisors (see below), whose sum is σ = 98251280. Its totient is φ = 83770848.

The previous prime is 90881723. The next prime is 90881743. The reversal of 90881731 is 13718809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90881731 - 2³ = 90881723 is a prime.

It is a super-2 number, since 2×90881731² = 16518978059112722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (90881831) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63936 + ... + 65341.

It is an arithmetic number, because the mean of its divisors is an integer number (12281410).

Almost surely, 2^90881731 is an apocalyptic number.

90881731 is a deficient number, since it is larger than the sum of its proper divisors (7369549).

90881731 is a wasteful number, since it uses less digits than its factorization.

90881731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129333.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 90881731 is about 9533.1910187513. The cubic root of 90881731 is about 449.5992003290.

The spelling of 90881731 in words is "ninety million, eight hundred eighty-one thousand, seven hundred thirty-one".