68143978 has 16 divisors (see below), whose sum is σ = 118298880. Its totient is φ = 28834416.

The previous prime is 68143961. The next prime is 68143987. The reversal of 68143978 is 87934186.

It is a happy 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, 29701 + ... + 31912.

It is an arithmetic number, because the mean of its divisors is an integer number (7393680).

Almost surely, 2^68143978 is an apocalyptic number.

68143978 is a deficient number, since it is larger than the sum of its proper divisors (50154902).

68143978 is a wasteful number, since it uses less digits than its factorization.

68143978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61701.

The product of its digits is 290304, while the sum is 46.

The square root of 68143978 is about 8254.9365836450. The cubic root of 68143978 is about 408.4533799290.

The spelling of 68143978 in words is "sixty-eight million, one hundred forty-three thousand, nine hundred seventy-eight".