275640408 has 80 divisors (see below), whose sum is σ = 782758680. Its totient is φ = 90605952.

The previous prime is 275640317. The next prime is 275640433. The reversal of 275640408 is 804046572.

275640408 is a `hidden beast` number, since 2 + 7 + 5 + 640 + 4 + 0 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 44391 + ... + 50217.

Almost surely, 2^275640408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 275640408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (391379340).

275640408 is an abundant number, since it is smaller than the sum of its proper divisors (507118272).

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

275640408 is a wasteful number, since it uses less digits than its factorization.

275640408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918 (or 5905 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The square root of 275640408 is about 16602.4217510579. The cubic root of 275640408 is about 650.8001255196.

The spelling of 275640408 in words is "two hundred seventy-five million, six hundred forty thousand, four hundred eight".