136149978 has 16 divisors (see below), whose sum is σ = 272567520. Its totient is φ = 45338736.

The previous prime is 136149977. The next prime is 136150009. The reversal of 136149978 is 879941631.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (136149977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4200 + ... + 17027.

It is an arithmetic number, because the mean of its divisors is an integer number (17035470).

Almost surely, 2^136149978 is an apocalyptic number.

136149978 is an abundant number, since it is smaller than the sum of its proper divisors (136417542).

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

136149978 is a wasteful number, since it uses less digits than its factorization.

136149978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22301.

The product of its digits is 326592, while the sum is 48.

The square root of 136149978 is about 11668.3322715802. The cubic root of 136149978 is about 514.4452857788.

The spelling of 136149978 in words is "one hundred thirty-six million, one hundred forty-nine thousand, nine hundred seventy-eight".