721613880 has 256 divisors, whose sum is σ = 2620800000. Its totient is φ = 175550976.

The previous prime is 721613861. The next prime is 721613911. The reversal of 721613880 is 88316127.

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

It is a congruent number.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 1445871 + ... + 1446369.

It is an arithmetic number, because the mean of its divisors is an integer number (10237500).

Almost surely, 2^721613880 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 721613880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1310400000).

721613880 is an abundant number, since it is smaller than the sum of its proper divisors (1899186120).

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

721613880 is a wasteful number, since it uses less digits than its factorization.

721613880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635 (or 625 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 721613880 is about 26862.8717749983. The cubic root of 721613880 is about 896.9501208268.

The spelling of 721613880 in words is "seven hundred twenty-one million, six hundred thirteen thousand, eight hundred eighty".