80640862806 has 48 divisors (see below), whose sum is σ = 188736984576. Its totient is φ = 22902267024.

The previous prime is 80640862801. The next prime is 80640862817. The reversal of 80640862806 is 60826804608.

It is a happy number.

It is a super-2 number, since 2×80640862806² (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 (80640862801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 772126 + ... + 870321.

It is an arithmetic number, because the mean of its divisors is an integer number (3932020512).

Almost surely, 2^80640862806 is an apocalyptic number.

80640862806 is an abundant number, since it is smaller than the sum of its proper divisors (108096121770).

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

80640862806 is a wasteful number, since it uses less digits than its factorization.

80640862806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642633 (or 1642626 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 48.

The spelling of 80640862806 in words is "eighty billion, six hundred forty million, eight hundred sixty-two thousand, eight hundred six".