721404016 has 40 divisors (see below), whose sum is σ = 1462361760. Its totient is φ = 344103936.

The previous prime is 721403983. The next prime is 721404049. The reversal of 721404016 is 610404127.

It is an interprime number because it is at equal distance from previous prime (721403983) and next prime (721404049).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148116 + ... + 152908.

It is an arithmetic number, because the mean of its divisors is an integer number (36559044).

Almost surely, 2^721404016 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 721404016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (731180880).

721404016 is an abundant number, since it is smaller than the sum of its proper divisors (740957744).

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

721404016 is a wasteful number, since it uses less digits than its factorization.

721404016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5233 (or 5227 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 721404016 is about 26858.9652816336. The cubic root of 721404016 is about 896.8631602900.

The spelling of 721404016 in words is "seven hundred twenty-one million, four hundred four thousand, sixteen".