136163978 has 4 divisors (see below), whose sum is σ = 204245970. Its totient is φ = 68081988.

The previous prime is 136163977. The next prime is 136163981. The reversal of 136163978 is 879361631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879361631 = 107 ⋅8218333.

It can be written as a sum of positive squares in only one way, i.e., 96687889 + 39476089 = 9833^2 + 6283^2 .

It is not an unprimeable number, because it can be changed into a prime (136163971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34040993 + ... + 34040996.

Almost surely, 2^136163978 is an apocalyptic number.

136163978 is a deficient number, since it is larger than the sum of its proper divisors (68081992).

136163978 is an equidigital number, since it uses as much as digits as its factorization.

136163978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68081991.

The product of its digits is 163296, while the sum is 44.

The square root of 136163978 is about 11668.9321705116. The cubic root of 136163978 is about 514.4629182633.

The spelling of 136163978 in words is "one hundred thirty-six million, one hundred sixty-three thousand, nine hundred seventy-eight".