721506160 has 20 divisors (see below), whose sum is σ = 1677502008. Its totient is φ = 288602432.

The previous prime is 721506143. The next prime is 721506161. The reversal of 721506160 is 61605127.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×721506160² = 1041142277835891200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (721506161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4509334 + ... + 4509493.

Almost surely, 2^721506160 is an apocalyptic number.

It is an amenable number.

721506160 is an abundant number, since it is smaller than the sum of its proper divisors (955995848).

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

721506160 is a wasteful number, since it uses less digits than its factorization.

721506160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9018840 (or 9018834 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 721506160 is about 26860.8667023237. The cubic root of 721506160 is about 896.9054874120.

The spelling of 721506160 in words is "seven hundred twenty-one million, five hundred six thousand, one hundred sixty".