275605640 has 64 divisors (see below), whose sum is σ = 657763200. Its totient is φ = 103638528.

The previous prime is 275605633. The next prime is 275605657. The reversal of 275605640 is 46506572.

It is a self number, because there is not a number n which added to its sum of digits gives 275605640.

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 15 ways as a sum of consecutive naturals, for example, 102797 + ... + 105443.

It is an arithmetic number, because the mean of its divisors is an integer number (10277550).

Almost surely, 2^275605640 is an apocalyptic number.

275605640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 275605640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (328881600).

275605640 is an abundant number, since it is smaller than the sum of its proper divisors (382157560).

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

275605640 is a wasteful number, since it uses less digits than its factorization.

275605640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2814 (or 2810 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 275605640 is about 16601.3746418783. The cubic root of 275605640 is about 650.7727614013.

The spelling of 275605640 in words is "two hundred seventy-five million, six hundred five thousand, six hundred forty".