721997452800 has 2400 divisors, whose sum is σ = 3202680140352. Its totient is φ = 158827806720.

The previous prime is 721997452789. The next prime is 721997452819. The reversal of 721997452800 is 8254799127.

721997452800 is a `hidden beast` number, since 7 + 21 + 9 + 97 + 4 + 528 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (2400).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 5270054332 + ... + 5270054468.

Almost surely, 2^721997452800 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 721997452800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1601340070176).

721997452800 is an abundant number, since it is smaller than the sum of its proper divisors (2480682687552).

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

721997452800 is a wasteful number, since it uses less digits than its factorization.

721997452800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 54.

The spelling of 721997452800 in words is "seven hundred twenty-one billion, nine hundred ninety-seven million, four hundred fifty-two thousand, eight hundred".