74615315920 has 80 divisors (see below), whose sum is σ = 178910276688. Its totient is φ = 28918702080.

The previous prime is 74615315881. The next prime is 74615315923. The reversal of 74615315920 is 2951351647.

It can be written as a sum of positive squares in 8 ways, for example, as 2819185216 + 71796130704 = 53096^2 + 267948^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74615315923) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 661062 + ... + 765658.

Almost surely, 2^74615315920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74615315920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89455138344).

74615315920 is an abundant number, since it is smaller than the sum of its proper divisors (104294960768).

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

74615315920 is a wasteful number, since it uses less digits than its factorization.

74615315920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104888 (or 104882 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 43.

The spelling of 74615315920 in words is "seventy-four billion, six hundred fifteen million, three hundred fifteen thousand, nine hundred twenty".