861982804 has 18 divisors (see below), whose sum is σ = 1592044314. Its totient is φ = 408306960.

The previous prime is 861982789. The next prime is 861982903. The reversal of 861982804 is 408289168.

It can be written as a sum of positive squares in only one way, i.e., 858372804 + 3610000 = 29298^2 + 1900^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297027 + ... + 299914.

Almost surely, 2^861982804 is an apocalyptic number.

It is an amenable number.

861982804 is a deficient number, since it is larger than the sum of its proper divisors (730061510).

861982804 is a wasteful number, since it uses less digits than its factorization.

861982804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 596983 (or 596962 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 46.

The square root of 861982804 is about 29359.5436613037. The cubic root of 861982804 is about 951.6988269474.

The spelling of 861982804 in words is "eight hundred sixty-one million, nine hundred eighty-two thousand, eight hundred four".