721855416 has 32 divisors (see below), whose sum is σ = 1806312960. Its totient is φ = 240395232.

The previous prime is 721855397. The next prime is 721855417. The reversal of 721855416 is 614558127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721855417) 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, 13561 + ... + 40343.

It is an arithmetic number, because the mean of its divisors is an integer number (56447280).

Almost surely, 2^721855416 is an apocalyptic number.

It is an amenable number.

721855416 is an abundant number, since it is smaller than the sum of its proper divisors (1084457544).

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

721855416 is a wasteful number, since it uses less digits than its factorization.

721855416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27915 (or 27911 counting only the distinct ones).

The product of its digits is 67200, while the sum is 39.

The square root of 721855416 is about 26867.3671207284. The cubic root of 721855416 is about 897.0501843018.

The spelling of 721855416 in words is "seven hundred twenty-one million, eight hundred fifty-five thousand, four hundred sixteen".