90051920 has 40 divisors (see below), whose sum is σ = 239282304. Its totient is φ = 30874752.

The previous prime is 90051917. The next prime is 90051947. The reversal of 90051920 is 2915009.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 90051920.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 79844 + ... + 80963.

Almost surely, 2^90051920 is an apocalyptic number.

It is an amenable number.

90051920 is an abundant number, since it is smaller than the sum of its proper divisors (149230384).

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

90051920 is a wasteful number, since it uses less digits than its factorization.

90051920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160827 (or 160821 counting only the distinct ones).

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 90051920 is about 9489.5690102343. The cubic root of 90051920 is about 448.2266338432.

Adding to 90051920 its reverse (2915009), we get a palindrome (92966929).

The spelling of 90051920 in words is "ninety million, fifty-one thousand, nine hundred twenty".