76670721 has 6 divisors (see below), whose sum is σ = 110746610. Its totient is φ = 51113808.

The previous prime is 76670641. The next prime is 76670723. The reversal of 76670721 is 12707667.

It can be written as a sum of positive squares in only one way, i.e., 41990400 + 34680321 = 6480^2 + 5889^2 .

It is not a de Polignac number, because 76670721 - 2¹⁷ = 76539649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76670723) 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 5 ways as a sum of consecutive naturals, for example, 4259476 + ... + 4259493.

Almost surely, 2^76670721 is an apocalyptic number.

It is an amenable number.

76670721 is a deficient number, since it is larger than the sum of its proper divisors (34075889).

76670721 is a wasteful number, since it uses less digits than its factorization.

76670721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518975 (or 8518972 counting only the distinct ones).

The product of its (nonzero) digits is 24696, while the sum is 36.

The square root of 76670721 is about 8756.1818733966. The cubic root of 76670721 is about 424.8247877531.

The spelling of 76670721 in words is "seventy-six million, six hundred seventy thousand, seven hundred twenty-one".