721745216 has 28 divisors (see below), whose sum is σ = 1433901120. Its totient is φ = 360447360.

The previous prime is 721745197. The next prime is 721745237. The reversal of 721745216 is 612547127.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52115 + ... + 64493.

Almost surely, 2^721745216 is an apocalyptic number.

It is an amenable number.

721745216 is a deficient number, since it is larger than the sum of its proper divisors (712155904).

721745216 is a wasteful number, since it uses less digits than its factorization.

721745216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13302 (or 13292 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 721745216 is about 26865.3162274335. The cubic root of 721745216 is about 897.0045334420.

The spelling of 721745216 in words is "seven hundred twenty-one million, seven hundred forty-five thousand, two hundred sixteen".