864677986 has 4 divisors (see below), whose sum is σ = 1297016982. Its totient is φ = 432338992.

The previous prime is 864677977. The next prime is 864677993. The reversal of 864677986 is 689776468.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 801173025 + 63504961 = 28305^2 + 7969^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 216169495 + ... + 216169498.

Almost surely, 2^864677986 is an apocalyptic number.

864677986 is a deficient number, since it is larger than the sum of its proper divisors (432338996).

864677986 is a wasteful number, since it uses less digits than its factorization.

864677986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432338995.

The product of its digits is 24385536, while the sum is 61.

The square root of 864677986 is about 29405.4074278865. The cubic root of 864677986 is about 952.6896946769.

The spelling of 864677986 in words is "eight hundred sixty-four million, six hundred seventy-seven thousand, nine hundred eighty-six".