68857975 has 24 divisors (see below), whose sum is σ = 91994112. Its totient is φ = 50978400.

The previous prime is 68857969. The next prime is 68857991. The reversal of 68857975 is 57975886.

It is not a de Polignac number, because 68857975 - 2³ = 68857967 is a prime.

It is a super-4 number, since 4×68857975⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent 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 23 ways as a sum of consecutive naturals, for example, 15894 + ... + 19756.

It is an arithmetic number, because the mean of its divisors is an integer number (3833088).

Almost surely, 2^68857975 is an apocalyptic number.

68857975 is a deficient number, since it is larger than the sum of its proper divisors (23136137).

68857975 is a wasteful number, since it uses less digits than its factorization.

68857975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3927 (or 3922 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 55.

The square root of 68857975 is about 8298.0705588709. The cubic root of 68857975 is about 409.8749866728.

The spelling of 68857975 in words is "sixty-eight million, eight hundred fifty-seven thousand, nine hundred seventy-five".