68639278 has 4 divisors (see below), whose sum is σ = 102958920. Its totient is φ = 34319638.

The previous prime is 68639269. The next prime is 68639327. The reversal of 68639278 is 87293686.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×68639278² = 9422700968722568, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 17159818 + ... + 17159821.

It is an arithmetic number, because the mean of its divisors is an integer number (25739730).

Almost surely, 2^68639278 is an apocalyptic number.

68639278 is a deficient number, since it is larger than the sum of its proper divisors (34319642).

68639278 is a wasteful number, since it uses less digits than its factorization.

68639278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34319641.

The product of its digits is 870912, while the sum is 49.

The square root of 68639278 is about 8284.8824976580. The cubic root of 68639278 is about 409.4405974015.

The spelling of 68639278 in words is "sixty-eight million, six hundred thirty-nine thousand, two hundred seventy-eight".