136637640 has 48 divisors (see below), whose sum is σ = 444073500. Its totient is φ = 36436608.

The previous prime is 136637597. The next prime is 136637651. The reversal of 136637640 is 46736631.

It is a happy number.

136637640 is a `hidden beast` number, since 1 + 3 + 6 + 6 + 3 + 7 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 126023076 + 10614564 = 11226^2 + 3258^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 136637595 and 136637604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189415 + ... + 190134.

Almost surely, 2^136637640 is an apocalyptic number.

136637640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136637640 is an abundant number, since it is smaller than the sum of its proper divisors (307435860).

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

136637640 is a wasteful number, since it uses less digits than its factorization.

136637640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379566 (or 379559 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 136637640 is about 11689.2104096042. The cubic root of 136637640 is about 515.0587672907.

The spelling of 136637640 in words is "one hundred thirty-six million, six hundred thirty-seven thousand, six hundred forty".