275640 has 32 divisors (see below), whose sum is σ = 827280. Its totient is φ = 73472.

The previous prime is 275623. The next prime is 275641. The reversal of 275640 is 46572.

275640 = T₄₉ + T₅₀ + ... + T₁₂₀.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 275640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (275641) by changing a digit.

275640 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1029 + ... + 1268.

2²⁷⁵⁶⁴⁰ is an apocalyptic number.

275640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

275640 is an abundant number, since it is smaller than the sum of its proper divisors (551640).

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

275640 is a wasteful number, since it uses less digits than its factorization.

275640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2311 (or 2307 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 275640 is about 525.0142855199. The cubic root of 275640 is about 65.0799804417.

The spelling of 275640 in words is "two hundred seventy-five thousand, six hundred forty".