623730666 has 48 divisors (see below), whose sum is σ = 1397446560. Its totient is φ = 185290560.

The previous prime is 623730649. The next prime is 623730677. The reversal of 623730666 is 666037326.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18801 + ... + 40011.

It is an arithmetic number, because the mean of its divisors is an integer number (29113470).

Almost surely, 2^623730666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 623730666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (698723280).

623730666 is an abundant number, since it is smaller than the sum of its proper divisors (773715894).

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

623730666 is a wasteful number, since it uses less digits than its factorization.

623730666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21271 (or 21258 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 39.

The square root of 623730666 is about 24974.6004172239. The cubic root of 623730666 is about 854.4087728930.

The spelling of 623730666 in words is "six hundred twenty-three million, seven hundred thirty thousand, six hundred sixty-six".