56618 has 4 divisors (see below), whose sum is σ = 84930. Its totient is φ = 28308.

The previous prime is 56611. The next prime is 56629. The reversal of 56618 is 81665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81665 = 5 ⋅16333.

It can be written as a sum of positive squares in only one way, i.e., 49729 + 6889 = 223^2 + 83^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (56611) by changing a digit.

56618 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153 + ... + 14156.

2⁵⁶⁶¹⁸ is an apocalyptic number.

56618 is a deficient number, since it is larger than the sum of its proper divisors (28312).

56618 is a wasteful number, since it uses less digits than its factorization.

56618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28311.

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

The square root of 56618 is about 237.9453718819. The cubic root of 56618 is about 38.3988461748.

Adding to 56618 its sum of digits (26), we get a square (56644 = 238²).

The spelling of 56618 in words is "fifty-six thousand, six hundred eighteen".