86129866 has 4 divisors (see below), whose sum is σ = 129194802. Its totient is φ = 43064932.

The previous prime is 86129861. The next prime is 86129891. The reversal of 86129866 is 66892168.

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., 81631225 + 4498641 = 9035^2 + 2121^2 .

It is not an unprimeable number, because it can be changed into a prime (86129861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21532465 + ... + 21532468.

Almost surely, 2^86129866 is an apocalyptic number.

86129866 is a deficient number, since it is larger than the sum of its proper divisors (43064936).

86129866 is a wasteful number, since it uses less digits than its factorization.

86129866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43064935.

The product of its digits is 248832, while the sum is 46.

The square root of 86129866 is about 9280.6177596106. The cubic root of 86129866 is about 441.6225663495.

The spelling of 86129866 in words is "eighty-six million, one hundred twenty-nine thousand, eight hundred sixty-six".