74563728 has 80 divisors (see below), whose sum is σ = 198469440. Its totient is φ = 24113152.

The previous prime is 74563681. The next prime is 74563729. The reversal of 74563728 is 82736547.

It is a self number, because there is not a number n which added to its sum of digits gives 74563728.

It is not an unprimeable number, because it can be changed into a prime (74563729) 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, 319900 + ... + 320132.

It is an arithmetic number, because the mean of its divisors is an integer number (2480868).

Almost surely, 2^74563728 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 74563728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99234720).

74563728 is an abundant number, since it is smaller than the sum of its proper divisors (123905712).

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

74563728 is a wasteful number, since it uses less digits than its factorization.

74563728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 410 counting only the distinct ones).

The product of its digits is 282240, while the sum is 42.

The square root of 74563728 is about 8635.0291256023. The cubic root of 74563728 is about 420.8970396470.

The spelling of 74563728 in words is "seventy-four million, five hundred sixty-three thousand, seven hundred twenty-eight".