724921845 has 16 divisors (see below), whose sum is σ = 1199871360. Its totient is φ = 373292864.

The previous prime is 724921829. The next prime is 724921919. The reversal of 724921845 is 548129427.

It is a cyclic number.

It is not a de Polignac number, because 724921845 - 2⁴ = 724921829 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 724921797 and 724921806.

It is a congruent number.

It is an unprimeable number.

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, 832809 + ... + 833678.

It is an arithmetic number, because the mean of its divisors is an integer number (74991960).

Almost surely, 2^724921845 is an apocalyptic number.

It is an amenable number.

724921845 is a deficient number, since it is larger than the sum of its proper divisors (474949515).

724921845 is a wasteful number, since it uses less digits than its factorization.

724921845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1666524.

The product of its digits is 161280, while the sum is 42.

The square root of 724921845 is about 26924.3726946423. The cubic root of 724921845 is about 898.3186076695.

The spelling of 724921845 in words is "seven hundred twenty-four million, nine hundred twenty-one thousand, eight hundred forty-five".