722539665 has 48 divisors (see below), whose sum is σ = 1291904640. Its totient is φ = 373390080.

The previous prime is 722539639. The next prime is 722539721. The reversal of 722539665 is 566935227.

It is not a de Polignac number, because 722539665 - 2⁵ = 722539633 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 722539665.

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 47 ways as a sum of consecutive naturals, for example, 186589 + ... + 190421.

It is an arithmetic number, because the mean of its divisors is an integer number (26914680).

Almost surely, 2^722539665 is an apocalyptic number.

It is an amenable number.

722539665 is a deficient number, since it is larger than the sum of its proper divisors (569364975).

722539665 is a wasteful number, since it uses less digits than its factorization.

722539665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3974 (or 3971 counting only the distinct ones).

The product of its digits is 680400, while the sum is 45.

The square root of 722539665 is about 26880.0979350894. The cubic root of 722539665 is about 897.3335336805. Note that the first 3 decimals are identical.

It can be divided in two parts, 72253 and 9665, that added together give a palindrome (81918).

The spelling of 722539665 in words is "seven hundred twenty-two million, five hundred thirty-nine thousand, six hundred sixty-five".