125645820 has 48 divisors (see below), whose sum is σ = 355114368. Its totient is φ = 33190720.

The previous prime is 125645813. The next prime is 125645857. The reversal of 125645820 is 28546521.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3366 + ... + 16205.

It is an arithmetic number, because the mean of its divisors is an integer number (7398216).

Almost surely, 2^125645820 is an apocalyptic number.

125645820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125645820 is an abundant number, since it is smaller than the sum of its proper divisors (229468548).

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

125645820 is a wasteful number, since it uses less digits than its factorization.

125645820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19690 (or 19688 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 125645820 is about 11209.1846269031. The cubic root of 125645820 is about 500.8596146118.

The spelling of 125645820 in words is "one hundred twenty-five million, six hundred forty-five thousand, eight hundred twenty".