7684678861 has 4 divisors (see below), whose sum is σ = 8136718812. Its totient is φ = 7232638912.

The previous prime is 7684678849. The next prime is 7684678891. The reversal of 7684678861 is 1688764867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1688764867 = 41 ⋅41189387.

It can be written as a sum of positive squares in 2 ways, for example, as 3576638025 + 4108040836 = 59805^2 + 64094^2 .

It is a cyclic number.

It is not a de Polignac number, because 7684678861 - 2⁷ = 7684678733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7684678861.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7684678891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 226019950 + ... + 226019983.

It is an arithmetic number, because the mean of its divisors is an integer number (2034179703).

Almost surely, 2^7684678861 is an apocalyptic number.

It is an amenable number.

7684678861 is a deficient number, since it is larger than the sum of its proper divisors (452039951).

7684678861 is a wasteful number, since it uses less digits than its factorization.

7684678861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452039950.

The product of its digits is 21676032, while the sum is 61.

The square root of 7684678861 is about 87662.3001124200. The cubic root of 7684678861 is about 1973.3702400541.

The spelling of 7684678861 in words is "seven billion, six hundred eighty-four million, six hundred seventy-eight thousand, eight hundred sixty-one".