136818890 has 32 divisors (see below), whose sum is σ = 280823760. Its totient is φ = 47545344.

The previous prime is 136818883. The next prime is 136818893. The reversal of 136818890 is 98818631.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 89056969 + 47761921 = 9437^2 + 6911^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (136818893) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28745 + ... + 33164.

Almost surely, 2^136818890 is an apocalyptic number.

136818890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

136818890 is an abundant number, since it is smaller than the sum of its proper divisors (144004870).

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

136818890 is a wasteful number, since it uses less digits than its factorization.

136818890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61946.

The product of its (nonzero) digits is 82944, while the sum is 44.

The square root of 136818890 is about 11696.9607163570. The cubic root of 136818890 is about 515.2864086973.

The spelling of 136818890 in words is "one hundred thirty-six million, eight hundred eighteen thousand, eight hundred ninety".