90972740 has 12 divisors (see below), whose sum is σ = 191042796. Its totient is φ = 36389088.

The previous prime is 90972737. The next prime is 90972743. The reversal of 90972740 is 4727909.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (90972737) and next prime (90972743).

It can be written as a sum of positive squares in 2 ways, for example, as 13778944 + 77193796 = 3712^2 + 8786^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90972694 and 90972703.

It is not an unprimeable number, because it can be changed into a prime (90972743) 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, 2274299 + ... + 2274338.

It is an arithmetic number, because the mean of its divisors is an integer number (15920233).

Almost surely, 2^90972740 is an apocalyptic number.

It is an amenable number.

90972740 is an abundant number, since it is smaller than the sum of its proper divisors (100070056).

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

90972740 is a wasteful number, since it uses less digits than its factorization.

90972740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4548646 (or 4548644 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 90972740 is about 9537.9630949171. The cubic root of 90972740 is about 449.7492265315.

The spelling of 90972740 in words is "ninety million, nine hundred seventy-two thousand, seven hundred forty".