123646680 has 96 divisors (see below), whose sum is σ = 423025200. Its totient is φ = 31235328.

The previous prime is 123646651. The next prime is 123646681. The reversal of 123646680 is 86646321.

123646680 is a `hidden beast` number, since 1 + 2 + 3 + 646 + 6 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123646681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2199 + ... + 15878.

Almost surely, 2^123646680 is an apocalyptic number.

123646680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123646680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211512600).

123646680 is an abundant number, since it is smaller than the sum of its proper divisors (299378520).

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

123646680 is a wasteful number, since it uses less digits than its factorization.

123646680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18113 (or 18106 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 123646680 is about 11119.6528722798. The cubic root of 123646680 is about 498.1890219696.

It can be divided in two parts, 12364 and 6680, that added together give a square (19044 = 138²).

The spelling of 123646680 in words is "one hundred twenty-three million, six hundred forty-six thousand, six hundred eighty".