724840665 has 16 divisors (see below), whose sum is σ = 1179403200. Its totient is φ = 380028992.

The previous prime is 724840663. The next prime is 724840673. The reversal of 724840665 is 566048427.

It is a cyclic number.

It is not a de Polignac number, because 724840665 - 2¹ = 724840663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (724840661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 408630 + ... + 410399.

It is an arithmetic number, because the mean of its divisors is an integer number (73712700).

Almost surely, 2^724840665 is an apocalyptic number.

It is an amenable number.

724840665 is a deficient number, since it is larger than the sum of its proper divisors (454562535).

724840665 is a wasteful number, since it uses less digits than its factorization.

724840665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819096.

The product of its (nonzero) digits is 322560, while the sum is 42.

The square root of 724840665 is about 26922.8650964194. The cubic root of 724840665 is about 898.2850738353.

The spelling of 724840665 in words is "seven hundred twenty-four million, eight hundred forty thousand, six hundred sixty-five".