55236643 has 16 divisors (see below), whose sum is σ = 69083136. Its totient is φ = 42906240.

The previous prime is 55236631. The next prime is 55236661. The reversal of 55236643 is 34663255.

It is a cyclic number.

It is not a de Polignac number, because 55236643 - 2¹⁷ = 55105571 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55236599 and 55236608.

It is not an unprimeable number, because it can be changed into a prime (55236673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28555 + ... + 30427.

It is an arithmetic number, because the mean of its divisors is an integer number (4317696).

Almost surely, 2^55236643 is an apocalyptic number.

55236643 is a deficient number, since it is larger than the sum of its proper divisors (13846493).

55236643 is a wasteful number, since it uses less digits than its factorization.

55236643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2274.

The product of its digits is 64800, while the sum is 34.

The square root of 55236643 is about 7432.1358302980. The cubic root of 55236643 is about 380.8398851420.

Adding to 55236643 its reverse (34663255), we get a palindrome (89899898).

The spelling of 55236643 in words is "fifty-five million, two hundred thirty-six thousand, six hundred forty-three".