642768125 has 20 divisors (see below), whose sum is σ = 816863520. Its totient is φ = 505470000.

The previous prime is 642768121. The next prime is 642768127. The reversal of 642768125 is 521867246.

It is not a de Polignac number, because 642768125 - 2² = 642768121 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642768121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 28160 + ... + 45590.

It is an arithmetic number, because the mean of its divisors is an integer number (40843176).

Almost surely, 2^642768125 is an apocalyptic number.

It is an amenable number.

642768125 is a deficient number, since it is larger than the sum of its proper divisors (174095395).

642768125 is an equidigital number, since it uses as much as digits as its factorization.

642768125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17510 (or 17495 counting only the distinct ones).

The product of its digits is 161280, while the sum is 41.

The square root of 642768125 is about 25352.8721252642. The cubic root of 642768125 is about 863.0145358059.

The spelling of 642768125 in words is "six hundred forty-two million, seven hundred sixty-eight thousand, one hundred twenty-five".