90500720 has 20 divisors (see below), whose sum is σ = 210414360. Its totient is φ = 36200256.

The previous prime is 90500713. The next prime is 90500731. The reversal of 90500720 is 2700509.

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

It is a congruent number.

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, 565550 + ... + 565709.

It is an arithmetic number, because the mean of its divisors is an integer number (10520718).

Almost surely, 2^90500720 is an apocalyptic number.

It is an amenable number.

90500720 is an abundant number, since it is smaller than the sum of its proper divisors (119913640).

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

90500720 is a wasteful number, since it uses less digits than its factorization.

90500720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1131272 (or 1131266 counting only the distinct ones).

The product of its (nonzero) digits is 630, while the sum is 23.

The square root of 90500720 is about 9513.1866375048. The cubic root of 90500720 is about 448.9700229489.

The spelling of 90500720 in words is "ninety million, five hundred thousand, seven hundred twenty".