721142856 has 144 divisors (see below), whose sum is σ = 2371611840. Its totient is φ = 193881600.

The previous prime is 721142843. The next prime is 721142867. The reversal of 721142856 is 658241127.

721142856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 721142856.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 143181 + ... + 148131.

Almost surely, 2^721142856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721142856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1185805920).

721142856 is an abundant number, since it is smaller than the sum of its proper divisors (1650468984).

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

721142856 is a wasteful number, since it uses less digits than its factorization.

721142856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5004 (or 4980 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 721142856 is about 26854.1031501706. The cubic root of 721142856 is about 896.7549208717.

The spelling of 721142856 in words is "seven hundred twenty-one million, one hundred forty-two thousand, eight hundred fifty-six".