61679 has 4 divisors (see below), whose sum is σ = 63384. Its totient is φ = 59976.

The previous prime is 61673. The next prime is 61681. The reversal of 61679 is 97616.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 797 + ... + 870.

It is an arithmetic number, because the mean of its divisors is an integer number (15846).

2⁶¹⁶⁷⁹ is an apocalyptic number.

61679 is a deficient number, since it is larger than the sum of its proper divisors (1705).

61679 is a wasteful number, since it uses less digits than its factorization.

61679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1704.

The product of its digits is 2268, while the sum is 29.

The square root of 61679 is about 248.3525719617. The cubic root of 61679 is about 39.5104923257.

Subtracting 61679 from its reverse (97616), we obtain a cube (35937 = 33³).

The spelling of 61679 in words is "sixty-one thousand, six hundred seventy-nine".