55321623 has 56 divisors (see below), whose sum is σ = 97687968. Its totient is φ = 30652992.

The previous prime is 55321579. The next prime is 55321627. The reversal of 55321623 is 32612355.

55321623 is a `hidden beast` number, since 5 + 5 + 32 + 1 + 623 = 666.

It is not a de Polignac number, because 55321623 - 2⁸ = 55321367 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55321627) 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 55 ways as a sum of consecutive naturals, for example, 188665 + ... + 188957.

It is an arithmetic number, because the mean of its divisors is an integer number (1744428).

Almost surely, 2^55321623 is an apocalyptic number.

55321623 is a deficient number, since it is larger than the sum of its proper divisors (42366345).

55321623 is an equidigital number, since it uses as much as digits as its factorization.

55321623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 340 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 55321623 is about 7437.8506976142. The cubic root of 55321623 is about 381.0350888385.

Adding to 55321623 its reverse (32612355), we get a palindrome (87933978).

The spelling of 55321623 in words is "fifty-five million, three hundred twenty-one thousand, six hundred twenty-three".