861228904 has 8 divisors (see below), whose sum is σ = 1614804210. Its totient is φ = 430614448.

The previous prime is 861228889. The next prime is 861228911. The reversal of 861228904 is 409822168.

It can be written as a sum of positive squares in only one way, i.e., 858372804 + 2856100 = 29298^2 + 1690^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53826799 + ... + 53826814.

Almost surely, 2^861228904 is an apocalyptic number.

It is an amenable number.

861228904 is a deficient number, since it is larger than the sum of its proper divisors (753575306).

861228904 is a wasteful number, since it uses less digits than its factorization.

861228904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107653619 (or 107653615 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 861228904 is about 29346.7017567562. The cubic root of 861228904 is about 951.4212904669.

The spelling of 861228904 in words is "eight hundred sixty-one million, two hundred twenty-eight thousand, nine hundred four".