721904160 has 48 divisors (see below), whose sum is σ = 2273999616. Its totient is φ = 192507648.

The previous prime is 721904137. The next prime is 721904177. The reversal of 721904160 is 61409127.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×721904160² = 1042291232450611200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 751504 + ... + 752463.

It is an arithmetic number, because the mean of its divisors is an integer number (47374992).

Almost surely, 2^721904160 is an apocalyptic number.

It is an amenable number.

721904160 is an abundant number, since it is smaller than the sum of its proper divisors (1552095456).

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

721904160 is a wasteful number, since it uses less digits than its factorization.

721904160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1503985 (or 1503977 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 721904160 is about 26868.2742281673. The cubic root of 721904160 is about 897.0703752473.

The spelling of 721904160 in words is "seven hundred twenty-one million, nine hundred four thousand, one hundred sixty".