74428569856 has 135 divisors (see below), whose sum is σ = 160572491191. Its totient is φ = 34431561728.

The previous prime is 74428569827. The next prime is 74428569863. The reversal of 74428569856 is 65896582447.

The square root of 74428569856 is 272816.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 23099136256 + 51329433600 = 151984^2 + 226560^2 .

It is a super-2 number, since 2×74428569856² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1261501155 + ... + 1261501213.

Almost surely, 2^74428569856 is an apocalyptic number.

74428569856 is the 272816-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74428569856

74428569856 is an abundant number, since it is smaller than the sum of its proper divisors (86143921335).

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

74428569856 is an frugal number, since it uses more digits than its factorization.

74428569856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202 (or 78 counting only the distinct ones).

The product of its digits is 116121600, while the sum is 64.

Multiplying 74428569856 by its sum of digits (64), we get a square (4763428470784 = 2182528²).

74428569856 divided by its sum of digits (64) gives a square (1162946404 = 34102²).

The spelling of 74428569856 in words is "seventy-four billion, four hundred twenty-eight million, five hundred sixty-nine thousand, eight hundred fifty-six".