124640640 has 128 divisors (see below), whose sum is σ = 441496800. Its totient is φ = 33232896.

The previous prime is 124640623. The next prime is 124640687. The reversal of 124640640 is 46046421.

124640640 is a `hidden beast` number, since 12 + 4 + 6 + 4 + 0 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13674 + ... + 20886.

Almost surely, 2^124640640 is an apocalyptic number.

124640640 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 124640640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (220748400).

124640640 is an abundant number, since it is smaller than the sum of its proper divisors (316856160).

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

124640640 is an equidigital number, since it uses as much as digits as its factorization.

124640640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7241 (or 7223 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 124640640 is about 11164.2572525001. The cubic root of 124640640 is about 499.5203934355.

The spelling of 124640640 in words is "one hundred twenty-four million, six hundred forty thousand, six hundred forty".