721844397984 has 96 divisors (see below), whose sum is σ = 1897770409920. Its totient is φ = 240243259392.

The previous prime is 721844397979. The next prime is 721844398021. The reversal of 721844397984 is 489793448127.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (66) 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 15 ways as a sum of consecutive naturals, for example, 314802342 + ... + 314804634.

It is an arithmetic number, because the mean of its divisors is an integer number (19768441770).

Almost surely, 2^721844397984 is an apocalyptic number.

It is an amenable number.

721844397984 is an abundant number, since it is smaller than the sum of its proper divisors (1175926011936).

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

721844397984 is a wasteful number, since it uses less digits than its factorization.

721844397984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5942 (or 5934 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 66.

The spelling of 721844397984 in words is "seven hundred twenty-one billion, eight hundred forty-four million, three hundred ninety-seven thousand, nine hundred eighty-four".