123788680 has 32 divisors (see below), whose sum is σ = 286055640. Its totient is φ = 48176640.

The previous prime is 123788677. The next prime is 123788681. The reversal of 123788680 is 86887321.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 81252196 + 42536484 = 9014^2 + 6522^2 .

It is a super-2 number, since 2×123788680² = 30647274592284800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (123788681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40341 + ... + 43300.

Almost surely, 2^123788680 is an apocalyptic number.

123788680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123788680 is an abundant number, since it is smaller than the sum of its proper divisors (162266960).

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

123788680 is a wasteful number, since it uses less digits than its factorization.

123788680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83689 (or 83685 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 43.

The square root of 123788680 is about 11126.0361315250. The cubic root of 123788680 is about 498.3796613442.

The spelling of 123788680 in words is "one hundred twenty-three million, seven hundred eighty-eight thousand, six hundred eighty".