255136240 has 40 divisors (see below), whose sum is σ = 618987168. Its totient is φ = 97616640.

The previous prime is 255136213. The next prime is 255136249. The reversal of 255136240 is 42631552.

255136240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×255136240² = 130189001922675200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 255136199 and 255136208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255136249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67491 + ... + 71170.

Almost surely, 2^255136240 is an apocalyptic number.

255136240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255136240 is an abundant number, since it is smaller than the sum of its proper divisors (363850928).

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

255136240 is a wasteful number, since it uses less digits than its factorization.

255136240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138697 (or 138691 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 28.

The square root of 255136240 is about 15972.9846929120. The cubic root of 255136240 is about 634.2454840547.

Adding to 255136240 its reverse (42631552), we get a palindrome (297767792).

The spelling of 255136240 in words is "two hundred fifty-five million, one hundred thirty-six thousand, two hundred forty".