861378228 has 36 divisors (see below), whose sum is σ = 2178423520. Its totient is φ = 286987536.

The previous prime is 861378179. The next prime is 861378239. The reversal of 861378228 is 822873168.

861378228 is a `hidden beast` number, since 8 + 613 + 7 + 8 + 2 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 93033 + ... + 101871.

Almost surely, 2^861378228 is an apocalyptic number.

It is an amenable number.

861378228 is an abundant number, since it is smaller than the sum of its proper divisors (1317045292).

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

861378228 is a wasteful number, since it uses less digits than its factorization.

861378228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11556 (or 11551 counting only the distinct ones).

The product of its digits is 258048, while the sum is 45.

The square root of 861378228 is about 29349.2457824728. The cubic root of 861378228 is about 951.4762746188.

The spelling of 861378228 in words is "eight hundred sixty-one million, three hundred seventy-eight thousand, two hundred twenty-eight".