721708896 has 48 divisors (see below), whose sum is σ = 1940703408. Its totient is φ = 234700800.

The previous prime is 721708891. The next prime is 721708907. The reversal of 721708896 is 698807127.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721708891) 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, 87745 + ... + 95616.

It is an arithmetic number, because the mean of its divisors is an integer number (40431321).

Almost surely, 2^721708896 is an apocalyptic number.

It is an amenable number.

721708896 is an abundant number, since it is smaller than the sum of its proper divisors (1218994512).

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

721708896 is a wasteful number, since it uses less digits than its factorization.

721708896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183415 (or 183407 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 721708896 is about 26864.6402544311. The cubic root of 721708896 is about 896.9894866958.

The spelling of 721708896 in words is "seven hundred twenty-one million, seven hundred eight thousand, eight hundred ninety-six".