721902879 has 12 divisors (see below), whose sum is σ = 1050710232. Its totient is φ = 477594000.

The previous prime is 721902871. The next prime is 721902899. The reversal of 721902879 is 978209127.

It is not a de Polignac number, because 721902879 - 2³ = 721902871 is a prime.

It is a super-2 number, since 2×721902879² = 1042287533416977282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721902871) 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 11 ways as a sum of consecutive naturals, for example, 304972 + ... + 307329.

It is an arithmetic number, because the mean of its divisors is an integer number (87559186).

Almost surely, 2^721902879 is an apocalyptic number.

721902879 is a deficient number, since it is larger than the sum of its proper divisors (328807353).

721902879 is a wasteful number, since it uses less digits than its factorization.

721902879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612438 (or 612435 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 721902879 is about 26868.2503896327. The cubic root of 721902879 is about 897.0698446377.

The spelling of 721902879 in words is "seven hundred twenty-one million, nine hundred two thousand, eight hundred seventy-nine".