90756731 has 4 divisors (see below), whose sum is σ = 97738032. Its totient is φ = 83775432.

The previous prime is 90756709. The next prime is 90756751. The reversal of 90756731 is 13765709.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 90756731 - 2¹⁴ = 90740347 is a prime.

It is a super-2 number, since 2×90756731² = 16473568443612722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90756751) 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, 3490631 + ... + 3490656.

It is an arithmetic number, because the mean of its divisors is an integer number (24434508).

Almost surely, 2^90756731 is an apocalyptic number.

90756731 is a deficient number, since it is larger than the sum of its proper divisors (6981301).

90756731 is a wasteful number, since it uses less digits than its factorization.

90756731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6981300.

The product of its (nonzero) digits is 39690, while the sum is 38.

The square root of 90756731 is about 9526.6327209566. The cubic root of 90756731 is about 449.3929774165.

The spelling of 90756731 in words is "ninety million, seven hundred fifty-six thousand, seven hundred thirty-one".