721286564 has 24 divisors (see below), whose sum is σ = 1285509120. Its totient is φ = 354016224.

The previous prime is 721286563. The next prime is 721286603. The reversal of 721286564 is 465682127.

It is not an unprimeable number, because it can be changed into a prime (721286561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199517 + ... + 203099.

It is an arithmetic number, because the mean of its divisors is an integer number (53562880).

Almost surely, 2^721286564 is an apocalyptic number.

It is an amenable number.

721286564 is a deficient number, since it is larger than the sum of its proper divisors (564222556).

721286564 is a wasteful number, since it uses less digits than its factorization.

721286564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4499 (or 4497 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 721286564 is about 26856.7787346137. The cubic root of 721286564 is about 896.8144847966.

The spelling of 721286564 in words is "seven hundred twenty-one million, two hundred eighty-six thousand, five hundred sixty-four".