90068731 has 4 divisors (see below), whose sum is σ = 90088432. Its totient is φ = 90049032.

The previous prime is 90068729. The next prime is 90068743. The reversal of 90068731 is 13786009.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13786009 = 1093 ⋅12613.

It is a cyclic number.

It is not a de Polignac number, because 90068731 - 2¹ = 90068729 is a prime.

It is a super-2 number, since 2×90068731² = 16224752607900722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90068701) 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, 970 + ... + 13456.

It is an arithmetic number, because the mean of its divisors is an integer number (22522108).

Almost surely, 2^90068731 is an apocalyptic number.

90068731 is a deficient number, since it is larger than the sum of its proper divisors (19701).

90068731 is a wasteful number, since it uses less digits than its factorization.

90068731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19700.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 90068731 is about 9490.4547309389. The cubic root of 90068731 is about 448.2545239356.

The spelling of 90068731 in words is "ninety million, sixty-eight thousand, seven hundred thirty-one".