136813978 has 12 divisors (see below), whose sum is σ = 238726602. Its totient is φ = 58634520.

The previous prime is 136813969. The next prime is 136813987. The reversal of 136813978 is 879318631.

136813978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (136813969) and next prime (136813987).

It can be written as a sum of positive squares in only one way, i.e., 136492489 + 321489 = 11683^2 + 567^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 697933 + ... + 698128.

Almost surely, 2^136813978 is an apocalyptic number.

136813978 is a deficient number, since it is larger than the sum of its proper divisors (101912624).

136813978 is a wasteful number, since it uses less digits than its factorization.

136813978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396077 (or 1396070 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 136813978 is about 11696.7507453993. The cubic root of 136813978 is about 515.2802421094.

The spelling of 136813978 in words is "one hundred thirty-six million, eight hundred thirteen thousand, nine hundred seventy-eight".