68139584 has 14 divisors (see below), whose sum is σ = 135214614. Its totient is φ = 34069760.

The previous prime is 68139569. The next prime is 68139601. The reversal of 68139584 is 48593186.

It can be written as a sum of positive squares in only one way, i.e., 53699584 + 14440000 = 7328^2 + 3800^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 532277 + ... + 532404.

Almost surely, 2^68139584 is an apocalyptic number.

68139584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

68139584 is a deficient number, since it is larger than the sum of its proper divisors (67075030).

68139584 is a wasteful number, since it uses less digits than its factorization.

68139584 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1064693 (or 1064683 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 68139584 is about 8254.6704355777. The cubic root of 68139584 is about 408.4446005632. Note that the first 3 decimals are identical.

The spelling of 68139584 in words is "sixty-eight million, one hundred thirty-nine thousand, five hundred eighty-four".