721440875 has 8 divisors (see below), whose sum is σ = 900358368. Its totient is φ = 577152600.

The previous prime is 721440857. The next prime is 721440947. The reversal of 721440875 is 578044127.

It is not a de Polignac number, because 721440875 - 2¹⁶ = 721375339 is a prime.

It is a super-2 number, since 2×721440875² = 1040953872241531250, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2885639 + ... + 2885888.

It is an arithmetic number, because the mean of its divisors is an integer number (112544796).

Almost surely, 2^721440875 is an apocalyptic number.

721440875 is a deficient number, since it is larger than the sum of its proper divisors (178917493).

721440875 is an equidigital number, since it uses as much as digits as its factorization.

721440875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5771542 (or 5771532 counting only the distinct ones).

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 721440875 is about 26859.6514310964. The cubic root of 721440875 is about 896.8784346326.

The spelling of 721440875 in words is "seven hundred twenty-one million, four hundred forty thousand, eight hundred seventy-five".