623906660 has 24 divisors (see below), whose sum is σ = 1410989496. Its totient is φ = 230365440.

The previous prime is 623906641. The next prime is 623906693. The reversal of 623906660 is 66609326.

It can be written as a sum of positive squares in 4 ways, for example, as 12432676 + 611473984 = 3526^2 + 24728^2 .

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, 1199561 + ... + 1200080.

It is an arithmetic number, because the mean of its divisors is an integer number (58791229).

Almost surely, 2^623906660 is an apocalyptic number.

It is an amenable number.

623906660 is an abundant number, since it is smaller than the sum of its proper divisors (787082836).

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

623906660 is a wasteful number, since it uses less digits than its factorization.

623906660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399663 (or 2399661 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 38.

The square root of 623906660 is about 24978.1236284874. The cubic root of 623906660 is about 854.4891263131.

The spelling of 623906660 in words is "six hundred twenty-three million, nine hundred six thousand, six hundred sixty".