721899360 has 432 divisors, whose sum is σ = 3090041136. Its totient is φ = 152119296.

The previous prime is 721899359. The next prime is 721899377. The reversal of 721899360 is 63998127.

It is a super-2 number, since 2×721899360² = 1042277371936819200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 916887 + ... + 917673.

It is an arithmetic number, because the mean of its divisors is an integer number (7152873).

Almost surely, 2^721899360 is an apocalyptic number.

721899360 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 721899360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1545020568).

721899360 is an abundant number, since it is smaller than the sum of its proper divisors (2368141776).

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

721899360 is a wasteful number, since it uses less digits than its factorization.

721899360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 835 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 721899360 is about 26868.1849033387. The cubic root of 721899360 is about 897.0683870114.

The spelling of 721899360 in words is "seven hundred twenty-one million, eight hundred ninety-nine thousand, three hundred sixty".