721864679 has 8 divisors (see below), whose sum is σ = 728829360. Its totient is φ = 714910336.

The previous prime is 721864673. The next prime is 721864697. The reversal of 721864679 is 976468127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721864679 - 2²⁴ = 705087463 is a prime.

It is a super-2 number, since 2×721864679² = 1042177229575546082, 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 (721864673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 278612 + ... + 281190.

It is an arithmetic number, because the mean of its divisors is an integer number (91103670).

Almost surely, 2^721864679 is an apocalyptic number.

721864679 is a deficient number, since it is larger than the sum of its proper divisors (6964681).

721864679 is a wasteful number, since it uses less digits than its factorization.

721864679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5169.

The product of its digits is 1016064, while the sum is 50.

The square root of 721864679 is about 26867.5395040186. The cubic root of 721864679 is about 897.0540213307.

The spelling of 721864679 in words is "seven hundred twenty-one million, eight hundred sixty-four thousand, six hundred seventy-nine".