721960186640 has 480 divisors, whose sum is σ = 2297024231040. Its totient is φ = 207973785600.

The previous prime is 721960186631. The next prime is 721960186667. The reversal of 721960186640 is 46681069127.

It is a super-2 number, since 2×721960186640² (a number of 25 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 33579734 + ... + 33601226.

It is an arithmetic number, because the mean of its divisors is an integer number (4785467148).

Almost surely, 2^721960186640 is an apocalyptic number.

721960186640 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 721960186640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1148512115520).

721960186640 is an abundant number, since it is smaller than the sum of its proper divisors (1575064044400).

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

721960186640 is a wasteful number, since it uses less digits than its factorization.

721960186640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21591 (or 21578 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The spelling of 721960186640 in words is "seven hundred twenty-one billion, nine hundred sixty million, one hundred eighty-six thousand, six hundred forty".