90721732 has 12 divisors (see below), whose sum is σ = 167119120. Its totient is φ = 42973416.

The previous prime is 90721723. The next prime is 90721733. The reversal of 90721732 is 23712709.

It is a junction number, because it is equal to n+sod(n) for n = 90721694 and 90721703.

It is not an unprimeable number, because it can be changed into a prime (90721733) 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, 596778 + ... + 596929.

Almost surely, 2^90721732 is an apocalyptic number.

It is an amenable number.

90721732 is a deficient number, since it is larger than the sum of its proper divisors (76397388).

90721732 is a wasteful number, since it uses less digits than its factorization.

90721732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193730 (or 1193728 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 90721732 is about 9524.7956408524. The cubic root of 90721732 is about 449.3352027226.

The spelling of 90721732 in words is "ninety million, seven hundred twenty-one thousand, seven hundred thirty-two".