74720720 has 20 divisors (see below), whose sum is σ = 173725860. Its totient is φ = 29888256.

The previous prime is 74720717. The next prime is 74720731. The reversal of 74720720 is 2702747.

It can be written as a sum of positive squares in 2 ways, for example, as 13630864 + 61089856 = 3692^2 + 7816^2 .

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466925 + ... + 467084.

It is an arithmetic number, because the mean of its divisors is an integer number (8686293).

Almost surely, 2^74720720 is an apocalyptic number.

It is an amenable number.

74720720 is an abundant number, since it is smaller than the sum of its proper divisors (99005140).

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

74720720 is a wasteful number, since it uses less digits than its factorization.

74720720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934022 (or 934016 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 29.

The square root of 74720720 is about 8644.1147609226. The cubic root of 74720720 is about 421.1922285152.

The spelling of 74720720 in words is "seventy-four million, seven hundred twenty thousand, seven hundred twenty".