136645240 has 32 divisors (see below), whose sum is σ = 307842480. Its totient is φ = 54588672.

The previous prime is 136645217. The next prime is 136645253. The reversal of 136645240 is 42546631.

It is a super-2 number, since 2×136645240² = 37343843229315200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39667 + ... + 42973.

Almost surely, 2^136645240 is an apocalyptic number.

136645240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

136645240 is an abundant number, since it is smaller than the sum of its proper divisors (171197240).

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

136645240 is a wasteful number, since it uses less digits than its factorization.

136645240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4351 (or 4347 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 136645240 is about 11689.5354911990. The cubic root of 136645240 is about 515.0683165726.

The spelling of 136645240 in words is "one hundred thirty-six million, six hundred forty-five thousand, two hundred forty".