125257640 has 16 divisors (see below), whose sum is σ = 281829780. Its totient is φ = 50103040.

The previous prime is 125257637. The next prime is 125257663. The reversal of 125257640 is 46752521.

It can be written as a sum of positive squares in 2 ways, for example, as 125126596 + 131044 = 11186^2 + 362^2 .

It is a junction number, because it is equal to n+sod(n) for n = 125257597 and 125257606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1565681 + ... + 1565760.

Almost surely, 2^125257640 is an apocalyptic number.

125257640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125257640 is an abundant number, since it is smaller than the sum of its proper divisors (156572140).

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

125257640 is a wasteful number, since it uses less digits than its factorization.

125257640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3131452 (or 3131448 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 125257640 is about 11191.8559676222. The cubic root of 125257640 is about 500.3432842579.

The spelling of 125257640 in words is "one hundred twenty-five million, two hundred fifty-seven thousand, six hundred forty".