74691720 has 80 divisors (see below), whose sum is σ = 251058060. Its totient is φ = 19916928.

The previous prime is 74691713. The next prime is 74691739. The reversal of 74691720 is 2719647.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 74338884 + 352836 = 8622^2 + 594^2 .

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 8287 + ... + 14766.

Almost surely, 2^74691720 is an apocalyptic number.

It is an amenable number.

74691720 is an abundant number, since it is smaller than the sum of its proper divisors (176366340).

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

74691720 is a wasteful number, since it uses less digits than its factorization.

74691720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23076 (or 23063 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 74691720 is about 8642.4371562656. The cubic root of 74691720 is about 421.1377315600.

The spelling of 74691720 in words is "seventy-four million, six hundred ninety-one thousand, seven hundred twenty".