812105680 has 40 divisors (see below), whose sum is σ = 1902583584. Its totient is φ = 322358400.

The previous prime is 812105669. The next prime is 812105683. The reversal of 812105680 is 86501218.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812105683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28266 + ... + 49225.

Almost surely, 2^812105680 is an apocalyptic number.

812105680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812105680 is an abundant number, since it is smaller than the sum of its proper divisors (1090477904).

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

812105680 is a wasteful number, since it uses less digits than its factorization.

812105680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77635 (or 77629 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 31.

The square root of 812105680 is about 28497.4679576976. The cubic root of 812105680 is about 932.9768105417.

Adding to 812105680 its reverse (86501218), we get a palindrome (898606898).

The spelling of 812105680 in words is "eight hundred twelve million, one hundred five thousand, six hundred eighty".