90047920 has 20 divisors (see below), whose sum is σ = 209361600. Its totient is φ = 36019136.

The previous prime is 90047879. The next prime is 90047939. The reversal of 90047920 is 2974009.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 562720 + ... + 562879.

It is an arithmetic number, because the mean of its divisors is an integer number (10468080).

Almost surely, 2^90047920 is an apocalyptic number.

It is an amenable number.

90047920 is an abundant number, since it is smaller than the sum of its proper divisors (119313680).

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

90047920 is a wasteful number, since it uses less digits than its factorization.

90047920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1125612 (or 1125606 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 90047920 is about 9489.3582501663. The cubic root of 90047920 is about 448.2199971790.

The spelling of 90047920 in words is "ninety million, forty-seven thousand, nine hundred twenty".