6781486878 has 24 divisors (see below), whose sum is σ = 15466549800. Its totient is φ = 2141522064.

The previous prime is 6781486867. The next prime is 6781486889. The reversal of 6781486878 is 8786841876.

6781486878 is a `hidden beast` number, since 6 + 7 + 81 + 486 + 8 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (6781486867) and next prime (6781486889).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9914113 + ... + 9914796.

It is an arithmetic number, because the mean of its divisors is an integer number (644439575).

Almost surely, 2^6781486878 is an apocalyptic number.

6781486878 is an abundant number, since it is smaller than the sum of its proper divisors (8685062922).

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

6781486878 is a wasteful number, since it uses less digits than its factorization.

6781486878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19828936 (or 19828933 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 63.

The square root of 6781486878 is about 82349.7837155630. The cubic root of 6781486878 is about 1892.8156085491.

The spelling of 6781486878 in words is "six billion, seven hundred eighty-one million, four hundred eighty-six thousand, eight hundred seventy-eight".