623952666 has 128 divisors (see below), whose sum is σ = 1567641600. Its totient is φ = 182787840.

The previous prime is 623952643. The next prime is 623952673. The reversal of 623952666 is 666259326.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1447471 + ... + 1447901.

It is an arithmetic number, because the mean of its divisors is an integer number (12247200).

Almost surely, 2^623952666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623952666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (783820800).

623952666 is an abundant number, since it is smaller than the sum of its proper divisors (943688934).

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

623952666 is a wasteful number, since it uses less digits than its factorization.

623952666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561 (or 555 counting only the distinct ones).

The product of its digits is 699840, while the sum is 45.

The square root of 623952666 is about 24979.0445373717. The cubic root of 623952666 is about 854.5101287392.

The spelling of 623952666 in words is "six hundred twenty-three million, nine hundred fifty-two thousand, six hundred sixty-six".