724424660 has 12 divisors (see below), whose sum is σ = 1521291828. Its totient is φ = 289769856.

The previous prime is 724424653. The next prime is 724424663. The reversal of 724424660 is 66424427.

It can be written as a sum of positive squares in 2 ways, for example, as 201753616 + 522671044 = 14204^2 + 22862^2 .

It is a super-2 number, since 2×724424660² = 1049582176032231200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 724424660.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (724424663) 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, 18110597 + ... + 18110636.

It is an arithmetic number, because the mean of its divisors is an integer number (126774319).

Almost surely, 2^724424660 is an apocalyptic number.

It is an amenable number.

724424660 is an abundant number, since it is smaller than the sum of its proper divisors (796867168).

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

724424660 is a wasteful number, since it uses less digits than its factorization.

724424660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36221242 (or 36221240 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 35.

The square root of 724424660 is about 26915.1381196530. The cubic root of 724424660 is about 898.1131911889.

The spelling of 724424660 in words is "seven hundred twenty-four million, four hundred twenty-four thousand, six hundred sixty".