168247978 has 4 divisors (see below), whose sum is σ = 252371970. Its totient is φ = 84123988.

The previous prime is 168247957. The next prime is 168247979. The reversal of 168247978 is 879742861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879742861 = 2131 ⋅412831.

It can be written as a sum of positive squares in only one way, i.e., 93373569 + 74874409 = 9663^2 + 8653^2 .

It is not an unprimeable number, because it can be changed into a prime (168247979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42061993 + ... + 42061996.

Almost surely, 2^168247978 is an apocalyptic number.

168247978 is a deficient number, since it is larger than the sum of its proper divisors (84123992).

168247978 is an equidigital number, since it uses as much as digits as its factorization.

168247978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84123991.

The product of its digits is 1354752, while the sum is 52.

The square root of 168247978 is about 12971.0438284665. The cubic root of 168247978 is about 552.0561908947.

The spelling of 168247978 in words is "one hundred sixty-eight million, two hundred forty-seven thousand, nine hundred seventy-eight".