716820989 has 4 divisors (see below), whose sum is σ = 719820480. Its totient is φ = 713821500.

The previous prime is 716820977. The next prime is 716821033. The reversal of 716820989 is 989028617.

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.

It is a cyclic number.

It is not a de Polignac number, because 716820989 - 2²⁰ = 715772413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (716820889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499387 + ... + 1499864.

It is an arithmetic number, because the mean of its divisors is an integer number (179955120).

Almost surely, 2^716820989 is an apocalyptic number.

It is an amenable number.

716820989 is a deficient number, since it is larger than the sum of its proper divisors (2999491).

716820989 is a wasteful number, since it uses less digits than its factorization.

716820989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999490.

The product of its (nonzero) digits is 435456, while the sum is 50.

The square root of 716820989 is about 26773.5128251785. The cubic root of 716820989 is about 894.9598887593.

The spelling of 716820989 in words is "seven hundred sixteen million, eight hundred twenty thousand, nine hundred eighty-nine".