275778945 has 128 divisors (see below), whose sum is σ = 563834880. Its totient is φ = 126904320.

The previous prime is 275778931. The next prime is 275778983. The reversal of 275778945 is 549877572.

It is a happy number.

275778945 is a `hidden beast` number, since 27 + 577 + 8 + 9 + 45 = 666.

It is not a de Polignac number, because 275778945 - 2⁷ = 275778817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 275778891 and 275778900.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 2012917 + ... + 2013053.

It is an arithmetic number, because the mean of its divisors is an integer number (4404960).

Almost surely, 2^275778945 is an apocalyptic number.

It is an amenable number.

275778945 is an abundant number, since it is smaller than the sum of its proper divisors (288055935).

275778945 is a wasteful number, since it uses less digits than its factorization.

275778945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 226 counting only the distinct ones).

The product of its digits is 4939200, while the sum is 54.

The square root of 275778945 is about 16606.5934194825. The cubic root of 275778945 is about 650.9091380758.

The spelling of 275778945 in words is "two hundred seventy-five million, seven hundred seventy-eight thousand, nine hundred forty-five".