721940744 has 64 divisors (see below), whose sum is σ = 1658016000. Its totient is φ = 287933184.

The previous prime is 721940729. The next prime is 721940753. The reversal of 721940744 is 447049127.

It is a junction number, because it is equal to n+sod(n) for n = 721940698 and 721940707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40082 + ... + 55230.

It is an arithmetic number, because the mean of its divisors is an integer number (25906500).

Almost surely, 2^721940744 is an apocalyptic number.

721940744 is a gapful number since it is divisible by the number (74) 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 721940744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (829008000).

721940744 is an abundant number, since it is smaller than the sum of its proper divisors (936075256).

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

721940744 is a wasteful number, since it uses less digits than its factorization.

721940744 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15222 (or 15218 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 721940744 is about 26868.9550224790. The cubic root of 721940744 is about 897.0855286292.

The spelling of 721940744 in words is "seven hundred twenty-one million, nine hundred forty thousand, seven hundred forty-four".