61856 has 12 divisors (see below), whose sum is σ = 121842. Its totient is φ = 30912.

The previous prime is 61843. The next prime is 61861. The reversal of 61856 is 65816.

It can be written as a sum of positive squares in only one way, i.e., 48400 + 13456 = 220^2 + 116^2 .

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935 + ... + 998.

2⁶¹⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

61856 is a deficient number, since it is larger than the sum of its proper divisors (59986).

61856 is a wasteful number, since it uses less digits than its factorization.

61856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943 (or 1935 counting only the distinct ones).

The product of its digits is 1440, while the sum is 26.

The square root of 61856 is about 248.7086649074. The cubic root of 61856 is about 39.5482506020.

The spelling of 61856 in words is "sixty-one thousand, eight hundred fifty-six".