721341216 has 36 divisors (see below), whose sum is σ = 2051314902. Its totient is φ = 240446976.

The previous prime is 721341209. The next prime is 721341223. The reversal of 721341216 is 612143127.

It is an interprime number because it is at equal distance from previous prime (721341209) and next prime (721341223).

It can be written as a sum of positive squares in only one way, i.e., 490179600 + 231161616 = 22140^2 + 15204^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 721341216.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1252041 + ... + 1252616.

Almost surely, 2^721341216 is an apocalyptic number.

It is an amenable number.

721341216 is an abundant number, since it is smaller than the sum of its proper divisors (1329973686).

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

721341216 is a wasteful number, since it uses less digits than its factorization.

721341216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2504673 (or 2504662 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 721341216 is about 26857.7961865824. The cubic root of 721341216 is about 896.8371348176.

The spelling of 721341216 in words is "seven hundred twenty-one million, three hundred forty-one thousand, two hundred sixteen".