76621728 has 24 divisors (see below), whose sum is σ = 201132288. Its totient is φ = 25540544.

The previous prime is 76621681. The next prime is 76621733. The reversal of 76621728 is 82712667.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398976 + ... + 399167.

It is an arithmetic number, because the mean of its divisors is an integer number (8380512).

Almost surely, 2^76621728 is an apocalyptic number.

It is an amenable number.

76621728 is an abundant number, since it is smaller than the sum of its proper divisors (124510560).

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

76621728 is a wasteful number, since it uses less digits than its factorization.

76621728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798156 (or 798148 counting only the distinct ones).

The product of its digits is 56448, while the sum is 39.

The square root of 76621728 is about 8753.3838028502. The cubic root of 76621728 is about 424.7342800364.

The spelling of 76621728 in words is "seventy-six million, six hundred twenty-one thousand, seven hundred twenty-eight".