125643640 has 32 divisors (see below), whose sum is σ = 284935680. Its totient is φ = 49859712.

The previous prime is 125643613. The next prime is 125643647. The reversal of 125643640 is 46346521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125643647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7287 + ... + 17446.

It is an arithmetic number, because the mean of its divisors is an integer number (8904240).

Almost surely, 2^125643640 is an apocalyptic number.

125643640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125643640 is an abundant number, since it is smaller than the sum of its proper divisors (159292040).

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

125643640 is a wasteful number, since it uses less digits than its factorization.

125643640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24871 (or 24867 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 125643640 is about 11209.0873847963. The cubic root of 125643640 is about 500.8567178972.

The spelling of 125643640 in words is "one hundred twenty-five million, six hundred forty-three thousand, six hundred forty".