68139572 has 24 divisors (see below), whose sum is σ = 122018400. Its totient is φ = 33284576.

The previous prime is 68139569. The next prime is 68139601. The reversal of 68139572 is 27593186.

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 7 ways as a sum of consecutive naturals, for example, 41438 + ... + 43050.

It is an arithmetic number, because the mean of its divisors is an integer number (5084100).

Almost surely, 2^68139572 is an apocalyptic number.

It is an amenable number.

68139572 is a deficient number, since it is larger than the sum of its proper divisors (53878828).

68139572 is a wasteful number, since it uses less digits than its factorization.

68139572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1855 (or 1853 counting only the distinct ones).

The product of its digits is 90720, while the sum is 41.

The square root of 68139572 is about 8254.6697087164. The cubic root of 68139572 is about 408.4445765863. Note that the first 3 decimals are identical.

The spelling of 68139572 in words is "sixty-eight million, one hundred thirty-nine thousand, five hundred seventy-two".