721761120 has 72 divisors (see below), whose sum is σ = 2463014736. Its totient is φ = 192469248.

The previous prime is 721761107. The next prime is 721761167. The reversal of 721761120 is 21167127.

721761120 is a `hidden beast` number, since 7 + 21 + 7 + 611 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×721761120² = 1041878228687308800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 249172 + ... + 252051.

It is an arithmetic number, because the mean of its divisors is an integer number (34208538).

Almost surely, 2^721761120 is an apocalyptic number.

It is an amenable number.

721761120 is an abundant number, since it is smaller than the sum of its proper divisors (1741253616).

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

721761120 is a wasteful number, since it uses less digits than its factorization.

721761120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501244 (or 501233 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 27.

The square root of 721761120 is about 26865.6122208298. The cubic root of 721761120 is about 897.0111220345.

The spelling of 721761120 in words is "seven hundred twenty-one million, seven hundred sixty-one thousand, one hundred twenty".