74520840 has 32 divisors (see below), whose sum is σ = 223562880. Its totient is φ = 19872192.

The previous prime is 74520799. The next prime is 74520871. The reversal of 74520840 is 4802547.

It is a Smith number, since the sum of its digits (30) 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 (30).

It is a junction number, because it is equal to n+sod(n) for n = 74520798 and 74520807.

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, 310384 + ... + 310623.

It is an arithmetic number, because the mean of its divisors is an integer number (6986340).

Almost surely, 2^74520840 is an apocalyptic number.

It is an amenable number.

74520840 is an abundant number, since it is smaller than the sum of its proper divisors (149042040).

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

74520840 is a wasteful number, since it uses less digits than its factorization.

74520840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 621021 (or 621017 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 30.

The square root of 74520840 is about 8632.5453951891. The cubic root of 74520840 is about 420.8163261652.

The spelling of 74520840 in words is "seventy-four million, five hundred twenty thousand, eight hundred forty".