74520728 has 16 divisors (see below), whose sum is σ = 139840080. Its totient is φ = 37230048.

The previous prime is 74520727. The next prime is 74520731. The reversal of 74520728 is 82702547.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74520727) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9326 + ... + 15362.

It is an arithmetic number, because the mean of its divisors is an integer number (8740005).

Almost surely, 2^74520728 is an apocalyptic number.

It is an amenable number.

74520728 is a deficient number, since it is larger than the sum of its proper divisors (65319352).

74520728 is a wasteful number, since it uses less digits than its factorization.

74520728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7586 (or 7582 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 35.

The square root of 74520728 is about 8632.5389081081. The cubic root of 74520728 is about 420.8161153452.

The spelling of 74520728 in words is "seventy-four million, five hundred twenty thousand, seven hundred twenty-eight".