275561856 has 96 divisors (see below), whose sum is σ = 796952520. Its totient is φ = 91392000.

The previous prime is 275561843. The next prime is 275561879. The reversal of 275561856 is 658165572.

275561856 is a `hidden beast` number, since 2 + 7 + 5 + 561 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 288676 + ... + 289628.

Almost surely, 2^275561856 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 275561856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (398476260).

275561856 is an abundant number, since it is smaller than the sum of its proper divisors (521390664).

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

275561856 is a wasteful number, since it uses less digits than its factorization.

275561856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1224 (or 1209 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 275561856 is about 16600.0559035203. The cubic root of 275561856 is about 650.7382979755.

The spelling of 275561856 in words is "two hundred seventy-five million, five hundred sixty-one thousand, eight hundred fifty-six".