724258621 has 4 divisors (see below), whose sum is σ = 737923932. Its totient is φ = 710593312.

The previous prime is 724258597. The next prime is 724258637. The reversal of 724258621 is 126852427.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 575760025 + 148498596 = 23995^2 + 12186^2 .

It is a cyclic number.

It is not a de Polignac number, because 724258621 - 2¹⁷ = 724127549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724258651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6832576 + ... + 6832681.

It is an arithmetic number, because the mean of its divisors is an integer number (184480983).

Almost surely, 2^724258621 is an apocalyptic number.

It is an amenable number.

724258621 is a deficient number, since it is larger than the sum of its proper divisors (13665311).

724258621 is a wasteful number, since it uses less digits than its factorization.

724258621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13665310.

The product of its digits is 53760, while the sum is 37.

The square root of 724258621 is about 26912.0534519386. The cubic root of 724258621 is about 898.0445697394.

The spelling of 724258621 in words is "seven hundred twenty-four million, two hundred fifty-eight thousand, six hundred twenty-one".