721544344 has 16 divisors (see below), whose sum is σ = 1396537920. Its totient is φ = 349134240.

The previous prime is 721544321. The next prime is 721544353. The reversal of 721544344 is 443445127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454479 + ... + 1454974.

It is an arithmetic number, because the mean of its divisors is an integer number (87283620).

Almost surely, 2^721544344 is an apocalyptic number.

It is an amenable number.

721544344 is a deficient number, since it is larger than the sum of its proper divisors (674993576).

721544344 is a wasteful number, since it uses less digits than its factorization.

721544344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909490 (or 2909486 counting only the distinct ones).

The product of its digits is 53760, while the sum is 34.

The square root of 721544344 is about 26861.5774667088. The cubic root of 721544344 is about 896.9213093305.

The spelling of 721544344 in words is "seven hundred twenty-one million, five hundred forty-four thousand, three hundred forty-four".