866986804 has 6 divisors (see below), whose sum is σ = 1517226914. Its totient is φ = 433493400.

The previous prime is 866986793. The next prime is 866986811. The reversal of 866986804 is 408689668.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 470976804 + 396010000 = 21702^2 + 19900^2 .

It is a super-2 number, since 2×866986804² = 1503332236620268832, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108373347 + ... + 108373354.

Almost surely, 2^866986804 is an apocalyptic number.

It is an amenable number.

866986804 is a deficient number, since it is larger than the sum of its proper divisors (650240110).

866986804 is a wasteful number, since it uses less digits than its factorization.

866986804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216746705 (or 216746703 counting only the distinct ones).

The product of its (nonzero) digits is 3981312, while the sum is 55.

The square root of 866986804 is about 29444.6396479903. The cubic root of 866986804 is about 953.5368818415.

The spelling of 866986804 in words is "eight hundred sixty-six million, nine hundred eighty-six thousand, eight hundred four".