90023731 has 12 divisors (see below), whose sum is σ = 104988072. Its totient is φ = 76966848.

The previous prime is 90023723. The next prime is 90023777. The reversal of 90023731 is 13732009.

It is not a de Polignac number, because 90023731 - 2³ = 90023723 is a prime.

It is a super-2 number, since 2×90023731² = 16208544286320722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90023696 and 90023705.

It is not an unprimeable number, because it can be changed into a prime (90023231) 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, 19096 + ... + 23338.

It is an arithmetic number, because the mean of its divisors is an integer number (8749006).

Almost surely, 2^90023731 is an apocalyptic number.

90023731 is a deficient number, since it is larger than the sum of its proper divisors (14964341).

90023731 is a wasteful number, since it uses less digits than its factorization.

90023731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4690 (or 4683 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 90023731 is about 9488.0836315876. The cubic root of 90023731 is about 448.1798594225.

The spelling of 90023731 in words is "ninety million, twenty-three thousand, seven hundred thirty-one".