623660 has 12 divisors (see below), whose sum is σ = 1309728. Its totient is φ = 249456.

The previous prime is 623653. The next prime is 623669. The reversal of 623660 is 66326.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 623660.

It is not an unprimeable number, because it can be changed into a prime (623669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15572 + ... + 15611.

It is an arithmetic number, because the mean of its divisors is an integer number (109144).

2⁶²³⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

623660 is an abundant number, since it is smaller than the sum of its proper divisors (686068).

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

623660 is a wasteful number, since it uses less digits than its factorization.

623660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31192 (or 31190 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 23.

The square root of 623660 is about 789.7214698867. The cubic root of 623660 is about 85.4376504729.

Adding to 623660 its reverse (66326), we get a palindrome (689986).

The spelling of 623660 in words is "six hundred twenty-three thousand, six hundred sixty".