812878783605 has 32 divisors (see below), whose sum is σ = 1651563244800. Its totient is φ = 371601729216.

The previous prime is 812878783603. The next prime is 812878783621. The reversal of 812878783605 is 506387878218.

812878783605 is a `hidden beast` number, since 8 + 12 + 8 + 7 + 8 + 7 + 8 + 3 + 605 = 666.

It is not a de Polignac number, because 812878783605 - 2¹ = 812878783603 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812878783601) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 430093650 + ... + 430095539.

It is an arithmetic number, because the mean of its divisors is an integer number (51611351400).

Almost surely, 2^812878783605 is an apocalyptic number.

It is an amenable number.

812878783605 is an abundant number, since it is smaller than the sum of its proper divisors (838684461195).

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

812878783605 is a wasteful number, since it uses less digits than its factorization.

812878783605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860189210 (or 860189204 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 63.

The spelling of 812878783605 in words is "eight hundred twelve billion, eight hundred seventy-eight million, seven hundred eighty-three thousand, six hundred five".