125664420 has 72 divisors (see below), whose sum is σ = 409316544. Its totient is φ = 28722624.

The previous prime is 125664419. The next prime is 125664443. The reversal of 125664420 is 24466521.

It is a Harshad number since it is a multiple of its sum of digits (30).

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 in 23 ways as a sum of consecutive naturals, for example, 18432 + ... + 24311.

It is an arithmetic number, because the mean of its divisors is an integer number (5684952).

Almost surely, 2^125664420 is an apocalyptic number.

125664420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

125664420 is an abundant number, since it is smaller than the sum of its proper divisors (283652124).

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

125664420 is a wasteful number, since it uses less digits than its factorization.

125664420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42769 (or 42760 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 125664420 is about 11210.0142729615. The cubic root of 125664420 is about 500.8843283380.

125664420 divided by its sum of digits (30) gives a palindrome (4188814).

The spelling of 125664420 in words is "one hundred twenty-five million, six hundred sixty-four thousand, four hundred twenty".