724643648 has 28 divisors (see below), whose sum is σ = 1487553540. Its totient is φ = 349827072.

The previous prime is 724643627. The next prime is 724643653. The reversal of 724643648 is 846346427.

It can be written as a sum of positive squares in 2 ways, for example, as 583319104 + 141324544 = 24152^2 + 11888^2 .

It is a junction number, because it is equal to n+sod(n) for n = 724643599 and 724643608.

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 193361 + ... + 197072.

Almost surely, 2^724643648 is an apocalyptic number.

It is an amenable number.

724643648 is an abundant number, since it is smaller than the sum of its proper divisors (762909892).

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

724643648 is a wasteful number, since it uses less digits than its factorization.

724643648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390474 (or 390464 counting only the distinct ones).

The product of its digits is 774144, while the sum is 44.

The square root of 724643648 is about 26919.2059318250. The cubic root of 724643648 is about 898.2036796403.

The spelling of 724643648 in words is "seven hundred twenty-four million, six hundred forty-three thousand, six hundred forty-eight".