136668285 has 24 divisors (see below), whose sum is σ = 255115224. Its totient is φ = 67282560.

The previous prime is 136668283. The next prime is 136668299. The reversal of 136668285 is 582866631.

It can be written as a sum of positive squares in 4 ways, for example, as 4372281 + 132296004 = 2091^2 + 11502^2 .

It is not a de Polignac number, because 136668285 - 2¹ = 136668283 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 136668285.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (136668283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 116226 + ... + 117395.

It is an arithmetic number, because the mean of its divisors is an integer number (10629801).

Almost surely, 2^136668285 is an apocalyptic number.

136668285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

136668285 is a deficient number, since it is larger than the sum of its proper divisors (118446939).

136668285 is a wasteful number, since it uses less digits than its factorization.

136668285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233645 (or 233642 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 136668285 is about 11690.5211603247. The cubic root of 136668285 is about 515.0972700928.

The spelling of 136668285 in words is "one hundred thirty-six million, six hundred sixty-eight thousand, two hundred eighty-five".