61906 has 8 divisors (see below), whose sum is σ = 100044. Its totient is φ = 28560.

The previous prime is 61879. The next prime is 61909. The reversal of 61906 is 60916.

It can be written as a sum of positive squares in 2 ways, for example, as 43681 + 18225 = 209^2 + 135^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (61909) 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, 1165 + ... + 1216.

2⁶¹⁹⁰⁶ is an apocalyptic number.

61906 is a deficient number, since it is larger than the sum of its proper divisors (38138).

61906 is a wasteful number, since it uses less digits than its factorization.

61906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2396.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 61906 is about 248.8091638184. The cubic root of 61906 is about 39.5589037317.

Subtracting from 61906 its reverse (60916), we obtain a triangular number (990 = T₄₄).

The spelling of 61906 in words is "sixty-one thousand, nine hundred six".