90121732 has 12 divisors (see below), whose sum is σ = 159613776. Its totient is φ = 44517800.

The previous prime is 90121729. The next prime is 90121739. The reversal of 90121732 is 23712109.

It is a junction number, because it is equal to n+sod(n) for n = 90121697 and 90121706.

It is not an unprimeable number, because it can be changed into a prime (90121739) 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, 135394 + ... + 136057.

It is an arithmetic number, because the mean of its divisors is an integer number (13301148).

Almost surely, 2^90121732 is an apocalyptic number.

It is an amenable number.

90121732 is a deficient number, since it is larger than the sum of its proper divisors (69492044).

90121732 is a wasteful number, since it uses less digits than its factorization.

90121732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271538 (or 271536 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 90121732 is about 9493.2466522260. The cubic root of 90121732 is about 448.3424319112.

The spelling of 90121732 in words is "ninety million, one hundred twenty-one thousand, seven hundred thirty-two".