76470721 has 2 divisors, whose sum is σ = 76470722. Its totient is φ = 76470720.

The previous prime is 76470703. The next prime is 76470733. The reversal of 76470721 is 12707467.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70896400 + 5574321 = 8420^2 + 2361^2 .

It is a cyclic number.

It is not a de Polignac number, because 76470721 - 2¹⁵ = 76437953 is a prime.

It is not a weakly prime, because it can be changed into another prime (76470701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38235360 + 38235361.

It is an arithmetic number, because the mean of its divisors is an integer number (38235361).

Almost surely, 2^76470721 is an apocalyptic number.

It is an amenable number.

76470721 is a deficient number, since it is larger than the sum of its proper divisors (1).

76470721 is an equidigital number, since it uses as much as digits as its factorization.

76470721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16464, while the sum is 34.

The square root of 76470721 is about 8744.7539130612. The cubic root of 76470721 is about 424.4550727678.

The spelling of 76470721 in words is "seventy-six million, four hundred seventy thousand, seven hundred twenty-one".