721614464 has 64 divisors (see below), whose sum is σ = 1468212480. Its totient is φ = 353203200.

The previous prime is 721614461. The next prime is 721614479. The reversal of 721614464 is 464416127.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (721614461) 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, 2462702 + ... + 2462994.

It is an arithmetic number, because the mean of its divisors is an integer number (22940820).

Almost surely, 2^721614464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721614464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734106240).

721614464 is an abundant number, since it is smaller than the sum of its proper divisors (746598016).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721614464 is a wasteful number, since it uses less digits than its factorization.

721614464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 649 (or 637 counting only the distinct ones).

The product of its digits is 32256, while the sum is 35.

The square root of 721614464 is about 26862.8826450178. The cubic root of 721614464 is about 896.9503627931.

The spelling of 721614464 in words is "seven hundred twenty-one million, six hundred fourteen thousand, four hundred sixty-four".