723665690 has 32 divisors (see below), whose sum is σ = 1504609344. Its totient is φ = 247671040.

The previous prime is 723665671. The next prime is 723665713. The reversal of 723665690 is 96566327.

It is a super-4 number, since 4×723665690⁴ (a number of 37 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191624 + ... + 195363.

It is an arithmetic number, because the mean of its divisors is an integer number (47019042).

Almost surely, 2^723665690 is an apocalyptic number.

723665690 is an abundant number, since it is smaller than the sum of its proper divisors (780943654).

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

723665690 is a wasteful number, since it uses less digits than its factorization.

723665690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387022.

The product of its (nonzero) digits is 408240, while the sum is 44.

The square root of 723665690 is about 26901.0351101960. The cubic root of 723665690 is about 897.7994345423.

The spelling of 723665690 in words is "seven hundred twenty-three million, six hundred sixty-five thousand, six hundred ninety".