68139425 has 12 divisors (see below), whose sum is σ = 86292096. Its totient is φ = 53350800.

The previous prime is 68139403. The next prime is 68139433. The reversal of 68139425 is 52493186.

It is a happy number.

It is not a de Polignac number, because 68139425 - 2²² = 63945121 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27821 + ... + 30170.

It is an arithmetic number, because the mean of its divisors is an integer number (7191008).

Almost surely, 2^68139425 is an apocalyptic number.

It is an amenable number.

68139425 is a deficient number, since it is larger than the sum of its proper divisors (18152671).

68139425 is a wasteful number, since it uses less digits than its factorization.

68139425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58048 (or 58043 counting only the distinct ones).

The product of its digits is 51840, while the sum is 38.

The square root of 68139425 is about 8254.6608046606. The cubic root of 68139425 is about 408.4442828685. Note that the first 3 decimals are identical.

The spelling of 68139425 in words is "sixty-eight million, one hundred thirty-nine thousand, four hundred twenty-five".