76861 has 4 divisors (see below), whose sum is σ = 77724. Its totient is φ = 76000.

The previous prime is 76847. The next prime is 76871. The reversal of 76861 is 16867.

76861 is nontrivially palindromic in base 3.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 16867 = 101 ⋅167.

It can be written as a sum of positive squares in 2 ways, for example, as 32761 + 44100 = 181^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 76861 - 2⁵ = 76829 is a prime.

It is a super-2 number, since 2×76861² = 11815226642, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76801) 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, 280 + ... + 481.

It is an arithmetic number, because the mean of its divisors is an integer number (19431).

2⁷⁶⁸⁶¹ is an apocalyptic number.

It is an amenable number.

76861 is a deficient number, since it is larger than the sum of its proper divisors (863).

76861 is a wasteful number, since it uses less digits than its factorization.

76861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862.

The product of its digits is 2016, while the sum is 28.

The square root of 76861 is about 277.2381647609. The cubic root of 76861 is about 42.5175936385.

The spelling of 76861 in words is "seventy-six thousand, eight hundred sixty-one".