623972665 has 8 divisors (see below), whose sum is σ = 754233480. Its totient is φ = 495533952.

The previous prime is 623972633. The next prime is 623972707. The reversal of 623972665 is 566279326.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 31147561 + 592825104 = 5581^2 + 24348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 623972665 - 2⁵ = 623972633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 454770 + ... + 456139.

It is an arithmetic number, because the mean of its divisors is an integer number (94279185).

Almost surely, 2^623972665 is an apocalyptic number.

It is an amenable number.

623972665 is a deficient number, since it is larger than the sum of its proper divisors (130260815).

623972665 is a wasteful number, since it uses less digits than its factorization.

623972665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 911051.

The product of its digits is 816480, while the sum is 46.

The square root of 623972665 is about 24979.4448497159. Note that the first 3 decimals coincide. The cubic root of 623972665 is about 854.5192582594.

The spelling of 623972665 in words is "six hundred twenty-three million, nine hundred seventy-two thousand, six hundred sixty-five".