90780720 has 40 divisors (see below), whose sum is σ = 281420976. Its totient is φ = 24208128.

The previous prime is 90780709. The next prime is 90780737. The reversal of 90780720 is 2708709.

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

It is a super-2 number, since 2×90780720² = 16482278247436800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188887 + ... + 189366.

Almost surely, 2^90780720 is an apocalyptic number.

It is an amenable number.

90780720 is an abundant number, since it is smaller than the sum of its proper divisors (190640256).

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

90780720 is a wasteful number, since it uses less digits than its factorization.

90780720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378269 (or 378263 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 90780720 is about 9527.8916870418. The cubic root of 90780720 is about 449.4325687442.

The spelling of 90780720 in words is "ninety million, seven hundred eighty thousand, seven hundred twenty".