68643278 has 16 divisors (see below), whose sum is σ = 112959360. Its totient is φ = 31025400.

The previous prime is 68643221. The next prime is 68643301. The reversal of 68643278 is 87234686.

It is a super-2 number, since 2×68643278² = 9423799229170568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4778 + ... + 12653.

It is an arithmetic number, because the mean of its divisors is an integer number (7059960).

Almost surely, 2^68643278 is an apocalyptic number.

68643278 is a deficient number, since it is larger than the sum of its proper divisors (44316082).

68643278 is a wasteful number, since it uses less digits than its factorization.

68643278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17623.

The product of its digits is 387072, while the sum is 44.

The square root of 68643278 is about 8285.1238976855. The cubic root of 68643278 is about 409.4485507223.

It can be divided in two parts, 68643 and 278, that added together give a cube (68921 = 41³).

The spelling of 68643278 in words is "sixty-eight million, six hundred forty-three thousand, two hundred seventy-eight".