67861 has 4 divisors (see below), whose sum is σ = 68800. Its totient is φ = 66924.

The previous prime is 67853. The next prime is 67867. The reversal of 67861 is 16876.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 67861 - 2³ = 67853 is a prime.

It is the 261-st Hogben number.

It is a deceptive number, since it divides R₆₇₈₆₀.

It is a Duffinian number.

67861 is a lucky number.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67867) by changing a digit.

It is a nontrivial repunit in base 260.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 351 + ... + 508.

It is an arithmetic number, because the mean of its divisors is an integer number (17200).

2⁶⁷⁸⁶¹ is an apocalyptic number.

67861 is the 117-th centered decagonal number.

It is an amenable number.

67861 is a deficient number, since it is larger than the sum of its proper divisors (939).

67861 is an equidigital number, since it uses as much as digits as its factorization.

67861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938.

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

The square root of 67861 is about 260.5014395354. The cubic root of 67861 is about 40.7887207704.

The spelling of 67861 in words is "sixty-seven thousand, eight hundred sixty-one".