76720291 has 2 divisors, whose sum is σ = 76720292. Its totient is φ = 76720290.

The previous prime is 76720253. The next prime is 76720327. The reversal of 76720291 is 19202767.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 76720291 - 2²¹ = 74623139 is a prime.

It is a super-2 number, since 2×76720291² = 11772006102249362, which contains 22 as substring.

It is a weakly prime.

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 as a sum of consecutive naturals, namely, 38360145 + 38360146.

It is an arithmetic number, because the mean of its divisors is an integer number (38360146).

Almost surely, 2^76720291 is an apocalyptic number.

76720291 is a deficient number, since it is larger than the sum of its proper divisors (1).

76720291 is an equidigital number, since it uses as much as digits as its factorization.

76720291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 76720291 is about 8759.0119876616. The cubic root of 76720291 is about 424.9163221648.

The spelling of 76720291 in words is "seventy-six million, seven hundred twenty thousand, two hundred ninety-one".