8461813878 has 80 divisors (see below), whose sum is σ = 22368513024. Its totient is φ = 2339662320.

The previous prime is 8461813861. The next prime is 8461813897. The reversal of 8461813878 is 8783181648.

It is a happy number.

8461813878 is a `hidden beast` number, since 8 + 4 + 618 + 13 + 8 + 7 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 39 ways as a sum of consecutive naturals, for example, 85200 + ... + 155507.

Almost surely, 2^8461813878 is an apocalyptic number.

8461813878 is an abundant number, since it is smaller than the sum of its proper divisors (13906699146).

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

8461813878 is a wasteful number, since it uses less digits than its factorization.

8461813878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240759 (or 240750 counting only the distinct ones).

The product of its digits is 2064384, while the sum is 54.

The square root of 8461813878 is about 91988.1181348983. The cubic root of 8461813878 is about 2037.7668339509.

The spelling of 8461813878 in words is "eight billion, four hundred sixty-one million, eight hundred thirteen thousand, eight hundred seventy-eight".