90817972 has 36 divisors (see below), whose sum is σ = 190856064. Its totient is φ = 37663920.

The previous prime is 90817949. The next prime is 90817973. The reversal of 90817972 is 27971809.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90817973) 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, 1398 + ... + 13549.

Almost surely, 2^90817972 is an apocalyptic number.

It is an amenable number.

90817972 is an abundant number, since it is smaller than the sum of its proper divisors (100038092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90817972 is a wasteful number, since it uses less digits than its factorization.

90817972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14996 (or 14987 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 90817972 is about 9529.8463786149. The cubic root of 90817972 is about 449.4940354392.

The spelling of 90817972 in words is "ninety million, eight hundred seventeen thousand, nine hundred seventy-two".