76721504 has 24 divisors (see below), whose sum is σ = 152017488. Its totient is φ = 38113920.

The previous prime is 76721483. The next prime is 76721509. The reversal of 76721504 is 40512767.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76721509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2612 + ... + 12659.

It is an arithmetic number, because the mean of its divisors is an integer number (6334062).

Almost surely, 2^76721504 is an apocalyptic number.

It is an amenable number.

76721504 is a deficient number, since it is larger than the sum of its proper divisors (75295984).

76721504 is a wasteful number, since it uses less digits than its factorization.

76721504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15438 (or 15430 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 76721504 is about 8759.0812303574. The cubic root of 76721504 is about 424.9185615584.

The spelling of 76721504 in words is "seventy-six million, seven hundred twenty-one thousand, five hundred four".