68943978 has 24 divisors (see below), whose sum is σ = 151912800. Its totient is φ = 22591464.

The previous prime is 68943967. The next prime is 68943983. The reversal of 68943978 is 87934986.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31398 + ... + 33521.

It is an arithmetic number, because the mean of its divisors is an integer number (6329700).

Almost surely, 2^68943978 is an apocalyptic number.

68943978 is an abundant number, since it is smaller than the sum of its proper divisors (82968822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

68943978 is a wasteful number, since it uses less digits than its factorization.

68943978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64986 (or 64983 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 68943978 is about 8303.2510500406. The cubic root of 68943978 is about 410.0455590856.

The spelling of 68943978 in words is "sixty-eight million, nine hundred forty-three thousand, nine hundred seventy-eight".