623646 has 16 divisors (see below), whose sum is σ = 1386000. Its totient is φ = 207864.

The previous prime is 623641. The next prime is 623653. The reversal of 623646 is 646326.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 623646.

It is not an unprimeable number, because it can be changed into a prime (623641) by changing a digit.

623646 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5721 + ... + 5828.

It is an arithmetic number, because the mean of its divisors is an integer number (86625).

2⁶²³⁶⁴⁶ is an apocalyptic number.

623646 is an abundant number, since it is smaller than the sum of its proper divisors (762354).

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

623646 is a wasteful number, since it uses less digits than its factorization.

623646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11560 (or 11554 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

The square root of 623646 is about 789.7126059523. The cubic root of 623646 is about 85.4370111630.

The spelling of 623646 in words is "six hundred twenty-three thousand, six hundred forty-six".