136640578 has 16 divisors (see below), whose sum is σ = 208980000. Its totient is φ = 66986752.

The previous prime is 136640573. The next prime is 136640587. The reversal of 136640578 is 875046631.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 136640578.

It is not an unprimeable number, because it can be changed into a prime (136640573) 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, 51693 + ... + 54271.

It is an arithmetic number, because the mean of its divisors is an integer number (13061250).

Almost surely, 2^136640578 is an apocalyptic number.

136640578 is a deficient number, since it is larger than the sum of its proper divisors (72339422).

136640578 is a wasteful number, since it uses less digits than its factorization.

136640578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 136640578 is about 11689.3360803768. The cubic root of 136640578 is about 515.0624588840.

The spelling of 136640578 in words is "one hundred thirty-six million, six hundred forty thousand, five hundred seventy-eight".