275409640 has 96 divisors (see below), whose sum is σ = 694202400. Its totient is φ = 97495680.

The previous prime is 275409637. The next prime is 275409647. The reversal of 275409640 is 46904572.

It is a self number, because there is not a number n which added to its sum of digits gives 275409640.

It is not an unprimeable number, because it can be changed into a prime (275409647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2673829 + ... + 2673931.

It is an arithmetic number, because the mean of its divisors is an integer number (7231275).

Almost surely, 2^275409640 is an apocalyptic number.

275409640 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 275409640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (347101200).

275409640 is an abundant number, since it is smaller than the sum of its proper divisors (418792760).

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

275409640 is a wasteful number, since it uses less digits than its factorization.

275409640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 180 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 275409640 is about 16595.4704663652. The cubic root of 275409640 is about 650.6184567341.

The spelling of 275409640 in words is "two hundred seventy-five million, four hundred nine thousand, six hundred forty".