721383017472 has 176 divisors, whose sum is σ = 2300726141280. Its totient is φ = 221963894784.

The previous prime is 721383017471. The next prime is 721383017477. The reversal of 721383017472 is 274710383127.

721383017472 is a `hidden beast` number, since 7 + 2 + 138 + 30 + 17 + 472 = 666.

It is not an unprimeable number, because it can be changed into a prime (721383017471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644103 + ... + 1362950.

Almost surely, 2^721383017472 is an apocalyptic number.

721383017472 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

721383017472 is an abundant number, since it is smaller than the sum of its proper divisors (1579343123808).

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

721383017472 is a wasteful number, since it uses less digits than its factorization.

721383017472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2007095 (or 2007071 counting only the distinct ones).

The product of its (nonzero) digits is 395136, while the sum is 45.

The spelling of 721383017472 in words is "seven hundred twenty-one billion, three hundred eighty-three million, seventeen thousand, four hundred seventy-two".