86820218 has 4 divisors (see below), whose sum is σ = 130230330. Its totient is φ = 43410108.

The previous prime is 86820203. The next prime is 86820259. The reversal of 86820218 is 81202868.

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., 60575089 + 26245129 = 7783^2 + 5123^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21705053 + ... + 21705056.

Almost surely, 2^86820218 is an apocalyptic number.

86820218 is a deficient number, since it is larger than the sum of its proper divisors (43410112).

86820218 is a wasteful number, since it uses less digits than its factorization.

86820218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43410111.

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 86820218 is about 9317.7367423640. The cubic root of 86820218 is about 442.7993322981.

The spelling of 86820218 in words is "eighty-six million, eight hundred twenty thousand, two hundred eighteen".