721614764 has 24 divisors (see below), whose sum is σ = 1360876608. Its totient is φ = 332830080.

The previous prime is 721614763. The next prime is 721614779. The reversal of 721614764 is 467416127.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (721614763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93584 + ... + 101000.

It is an arithmetic number, because the mean of its divisors is an integer number (56703192).

Almost surely, 2^721614764 is an apocalyptic number.

It is an amenable number.

721614764 is a deficient number, since it is larger than the sum of its proper divisors (639261844).

721614764 is a wasteful number, since it uses less digits than its factorization.

721614764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9305 (or 9303 counting only the distinct ones).

The product of its digits is 56448, while the sum is 38.

The square root of 721614764 is about 26862.8882289303. Note that the first 3 decimals coincide. The cubic root of 721614764 is about 896.9504870909.

The spelling of 721614764 in words is "seven hundred twenty-one million, six hundred fourteen thousand, seven hundred sixty-four".