721416016 has 20 divisors (see below), whose sum is σ = 1471309600. Its totient is φ = 341723232.

The previous prime is 721416013. The next prime is 721416037. The reversal of 721416016 is 610614127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721416011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1186236 + ... + 1186843.

It is an arithmetic number, because the mean of its divisors is an integer number (73565480).

Almost surely, 2^721416016 is an apocalyptic number.

721416016 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

721416016 is an abundant number, since it is smaller than the sum of its proper divisors (749893584).

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

721416016 is a wasteful number, since it uses less digits than its factorization.

721416016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2373106 (or 2373100 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 721416016 is about 26859.1886698016. The cubic root of 721416016 is about 896.8681331383.

The spelling of 721416016 in words is "seven hundred twenty-one million, four hundred sixteen thousand, sixteen".