61867 has 4 divisors (see below), whose sum is σ = 66640. Its totient is φ = 57096.

The previous prime is 61861. The next prime is 61871. The reversal of 61867 is 76816.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-61867 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (61861) 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, 2367 + ... + 2392.

It is an arithmetic number, because the mean of its divisors is an integer number (16660).

2⁶¹⁸⁶⁷ is an apocalyptic number.

61867 is a deficient number, since it is larger than the sum of its proper divisors (4773).

61867 is a wasteful number, since it uses less digits than its factorization.

61867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4772.

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

The square root of 61867 is about 248.7307781518. The cubic root of 61867 is about 39.5505947830.

The spelling of 61867 in words is "sixty-one thousand, eight hundred sixty-seven".