74428644 has 48 divisors (see below), whose sum is σ = 187084800. Its totient is φ = 22962720.

The previous prime is 74428637. The next prime is 74428687. The reversal of 74428644 is 44682447.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4207 + ... + 12905.

It is an arithmetic number, because the mean of its divisors is an integer number (3897600).

Almost surely, 2^74428644 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 74428644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93542400).

74428644 is an abundant number, since it is smaller than the sum of its proper divisors (112656156).

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

74428644 is a wasteful number, since it uses less digits than its factorization.

74428644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8760 (or 8758 counting only the distinct ones).

The product of its digits is 172032, while the sum is 39.

The square root of 74428644 is about 8627.2037184710. The cubic root of 74428644 is about 420.6427121223.

The spelling of 74428644 in words is "seventy-four million, four hundred twenty-eight thousand, six hundred forty-four".