721004544 has 384 divisors, whose sum is σ = 2476656000. Its totient is φ = 205258752.

The previous prime is 721004519. The next prime is 721004597. The reversal of 721004544 is 445400127.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12220387 + ... + 12220445.

It is an arithmetic number, because the mean of its divisors is an integer number (6449625).

Almost surely, 2^721004544 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 721004544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1238328000).

721004544 is an abundant number, since it is smaller than the sum of its proper divisors (1755651456).

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

721004544 is a wasteful number, since it uses less digits than its factorization.

721004544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120 (or 94 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 27.

The square root of 721004544 is about 26851.5277777634. The cubic root of 721004544 is about 896.6975860011.

The spelling of 721004544 in words is "seven hundred twenty-one million, four thousand, five hundred forty-four".