721375416 has 64 divisors (see below), whose sum is σ = 2121703200. Its totient is φ = 226312704.

The previous prime is 721375397. The next prime is 721375423. The reversal of 721375416 is 614573127.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94555 + ... + 101898.

Almost surely, 2^721375416 is an apocalyptic number.

It is an amenable number.

721375416 is an abundant number, since it is smaller than the sum of its proper divisors (1400327784).

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

721375416 is a wasteful number, since it uses less digits than its factorization.

721375416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196485 (or 196475 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 721375416 is about 26858.4328656755. The cubic root of 721375416 is about 896.8513081125.

The spelling of 721375416 in words is "seven hundred twenty-one million, three hundred seventy-five thousand, four hundred sixteen".