6812557878 has 16 divisors (see below), whose sum is σ = 15571560960. Its totient is φ = 1946445096.

The previous prime is 6812557877. The next prime is 6812557931. The reversal of 6812557878 is 8787552186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6812557877) 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, 81101838 + ... + 81101921.

It is an arithmetic number, because the mean of its divisors is an integer number (973222560).

Almost surely, 2^6812557878 is an apocalyptic number.

6812557878 is an abundant number, since it is smaller than the sum of its proper divisors (8759003082).

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

6812557878 is a wasteful number, since it uses less digits than its factorization.

6812557878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162203771.

The product of its digits is 7526400, while the sum is 57.

The square root of 6812557878 is about 82538.2207101655. The cubic root of 6812557878 is about 1895.7020002238.

The spelling of 6812557878 in words is "six billion, eight hundred twelve million, five hundred fifty-seven thousand, eight hundred seventy-eight".