721461120 has 64 divisors (see below), whose sum is σ = 2299663440. Its totient is φ = 192389120.

The previous prime is 721461107. The next prime is 721461151. The reversal of 721461120 is 21164127.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×721461120² = 1041012295343308800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 185961 + ... + 189800.

Almost surely, 2^721461120 is an apocalyptic number.

It is an amenable number.

721461120 is an abundant number, since it is smaller than the sum of its proper divisors (1578202320).

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

721461120 is a wasteful number, since it uses less digits than its factorization.

721461120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375783 (or 375771 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 721461120 is about 26860.0282948473. The cubic root of 721461120 is about 896.8868239244.

The spelling of 721461120 in words is "seven hundred twenty-one million, four hundred sixty-one thousand, one hundred twenty".