125780638 has 4 divisors (see below), whose sum is σ = 188670960. Its totient is φ = 62890318.

The previous prime is 125780621. The next prime is 125780651. The reversal of 125780638 is 836087521.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 125780638.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 31445158 + ... + 31445161.

It is an arithmetic number, because the mean of its divisors is an integer number (47167740).

Almost surely, 2^125780638 is an apocalyptic number.

125780638 is a deficient number, since it is larger than the sum of its proper divisors (62890322).

125780638 is an equidigital number, since it uses as much as digits as its factorization.

125780638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62890321.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 125780638 is about 11215.1967437045. The cubic root of 125780638 is about 501.0386914128.

The spelling of 125780638 in words is "one hundred twenty-five million, seven hundred eighty thousand, six hundred thirty-eight".