136468809 has 24 divisors (see below), whose sum is σ = 215921160. Its totient is φ = 82672128.

The previous prime is 136468807. The next prime is 136468819. The reversal of 136468809 is 908864631.

It can be written as a sum of positive squares in 4 ways, for example, as 32490000 + 103978809 = 5700^2 + 10197^2 .

It is not a de Polignac number, because 136468809 - 2¹ = 136468807 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136468807) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10942 + ... + 19815.

It is an arithmetic number, because the mean of its divisors is an integer number (8996715).

Almost surely, 2^136468809 is an apocalyptic number.

It is an amenable number.

136468809 is a deficient number, since it is larger than the sum of its proper divisors (79452351).

136468809 is a wasteful number, since it uses less digits than its factorization.

136468809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30809 (or 30806 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 136468809 is about 11681.9865177118. The cubic root of 136468809 is about 514.8465423949.

The spelling of 136468809 in words is "one hundred thirty-six million, four hundred sixty-eight thousand, eight hundred nine".