716776721 has 4 divisors (see below), whose sum is σ = 716830272. Its totient is φ = 716723172.

The previous prime is 716776693. The next prime is 716776727. The reversal of 716776721 is 127677617.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 716776721 - 2²² = 712582417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (716776727) 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 in 3 ways as a sum of consecutive naturals, for example, 12860 + ... + 39986.

It is an arithmetic number, because the mean of its divisors is an integer number (179207568).

Almost surely, 2^716776721 is an apocalyptic number.

It is an amenable number.

716776721 is a deficient number, since it is larger than the sum of its proper divisors (53551).

716776721 is a wasteful number, since it uses less digits than its factorization.

716776721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53550.

The product of its digits is 172872, while the sum is 44.

The square root of 716776721 is about 26772.6860998294. The cubic root of 716776721 is about 894.9414653311.

The spelling of 716776721 in words is "seven hundred sixteen million, seven hundred seventy-six thousand, seven hundred twenty-one".