125631780 has 24 divisors (see below), whose sum is σ = 351769152. Its totient is φ = 33501792.

The previous prime is 125631769. The next prime is 125631787. The reversal of 125631780 is 87136521.

It is not an unprimeable number, because it can be changed into a prime (125631787) 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, 1046872 + ... + 1046991.

It is an arithmetic number, because the mean of its divisors is an integer number (14657048).

Almost surely, 2^125631780 is an apocalyptic number.

125631780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125631780 is an abundant number, since it is smaller than the sum of its proper divisors (226137372).

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

125631780 is a wasteful number, since it uses less digits than its factorization.

125631780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093875 (or 2093873 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 33.

The square root of 125631780 is about 11208.5583372707. The cubic root of 125631780 is about 500.8409581192.

The spelling of 125631780 in words is "one hundred twenty-five million, six hundred thirty-one thousand, seven hundred eighty".