86780821136 has 20 divisors (see below), whose sum is σ = 168142955052. Its totient is φ = 43389090816.

The previous prime is 86780821123. The next prime is 86780821147. The reversal of 86780821136 is 63112808768.

It can be written as a sum of positive squares in 2 ways, for example, as 61129595536 + 25651225600 = 247244^2 + 160160^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665576 + ... + 785208.

Almost surely, 2^86780821136 is an apocalyptic number.

It is an amenable number.

86780821136 is a deficient number, since it is larger than the sum of its proper divisors (81362133916).

86780821136 is a wasteful number, since it uses less digits than its factorization.

86780821136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164978 (or 164972 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 50.

The spelling of 86780821136 in words is "eighty-six billion, seven hundred eighty million, eight hundred twenty-one thousand, one hundred thirty-six".