74155728 has 40 divisors (see below), whose sum is σ = 191927200. Its totient is φ = 24672384.

The previous prime is 74155723. The next prime is 74155729. The reversal of 74155728 is 82755147.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74155723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32943 + ... + 35121.

It is an arithmetic number, because the mean of its divisors is an integer number (4798180).

Almost surely, 2^74155728 is an apocalyptic number.

It is an amenable number.

74155728 is an abundant number, since it is smaller than the sum of its proper divisors (117771472).

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

74155728 is a wasteful number, since it uses less digits than its factorization.

74155728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2899 (or 2893 counting only the distinct ones).

The product of its digits is 78400, while the sum is 39.

The square root of 74155728 is about 8611.3720161192. The cubic root of 74155728 is about 420.1279428807.

The spelling of 74155728 in words is "seventy-four million, one hundred fifty-five thousand, seven hundred twenty-eight".