76721320 has 32 divisors (see below), whose sum is σ = 185902920. Its totient is φ = 28327680.

The previous prime is 76721287. The next prime is 76721339. The reversal of 76721320 is 2312767.

It can be written as a sum of positive squares in 4 ways, for example, as 25140196 + 51581124 = 5014^2 + 7182^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 73251 + ... + 74290.

Almost surely, 2^76721320 is an apocalyptic number.

It is an amenable number.

76721320 is an abundant number, since it is smaller than the sum of its proper divisors (109181600).

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

76721320 is a wasteful number, since it uses less digits than its factorization.

76721320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147565 (or 147561 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 76721320 is about 8759.0707269664. The cubic root of 76721320 is about 424.9182218663.

The spelling of 76721320 in words is "seventy-six million, seven hundred twenty-one thousand, three hundred twenty".