68577978 has 16 divisors (see below), whose sum is σ = 156749760. Its totient is φ = 19593696.

The previous prime is 68577961. The next prime is 68577979. The reversal of 68577978 is 87977586.

It is not an unprimeable number, because it can be changed into a prime (68577979) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 816363 + ... + 816446.

It is an arithmetic number, because the mean of its divisors is an integer number (9796860).

Almost surely, 2^68577978 is an apocalyptic number.

68577978 is an abundant number, since it is smaller than the sum of its proper divisors (88171782).

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

68577978 is a wasteful number, since it uses less digits than its factorization.

68577978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632821.

The product of its digits is 5927040, while the sum is 57.

The square root of 68577978 is about 8281.1821619863. The cubic root of 68577978 is about 409.3186740911.

The spelling of 68577978 in words is "sixty-eight million, five hundred seventy-seven thousand, nine hundred seventy-eight".