721760669 has 16 divisors (see below), whose sum is σ = 836812800. Its totient is φ = 609723504.

The previous prime is 721760639. The next prime is 721760713. The reversal of 721760669 is 966067127.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721760669 is a prime.

It is a super-2 number, since 2×721760669² = 1041876926630655122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721760609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 500852 + ... + 502290.

It is an arithmetic number, because the mean of its divisors is an integer number (52300800).

Almost surely, 2^721760669 is an apocalyptic number.

721760669 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

721760669 is a deficient number, since it is larger than the sum of its proper divisors (115052131).

721760669 is a wasteful number, since it uses less digits than its factorization.

721760669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2432.

The product of its (nonzero) digits is 190512, while the sum is 44.

The square root of 721760669 is about 26865.6038271988. The cubic root of 721760669 is about 897.0109351988.

The spelling of 721760669 in words is "seven hundred twenty-one million, seven hundred sixty thousand, six hundred sixty-nine".