86720820860 has 24 divisors (see below), whose sum is σ = 182519341200. Its totient is φ = 34611067904.

The previous prime is 86720820829. The next prime is 86720820863. The reversal of 86720820860 is 6802802768.

It is a super-2 number, since 2×86720820860² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86720820863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4819574 + ... + 4837533.

It is an arithmetic number, because the mean of its divisors is an integer number (7604972550).

Almost surely, 2^86720820860 is an apocalyptic number.

It is an amenable number.

86720820860 is an abundant number, since it is smaller than the sum of its proper divisors (95798520340).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86720820860 is a wasteful number, since it uses less digits than its factorization.

86720820860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9657565 (or 9657563 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 47.

The spelling of 86720820860 in words is "eighty-six billion, seven hundred twenty million, eight hundred twenty thousand, eight hundred sixty".