55642213 has 24 divisors (see below), whose sum is σ = 64302840. Its totient is φ = 48048000.

The previous prime is 55642193. The next prime is 55642231. The reversal of 55642213 is 31224655.

It can be written as a sum of positive squares in 4 ways, for example, as 17288964 + 38353249 = 4158^2 + 6193^2 .

It is not a de Polignac number, because 55642213 - 2¹³ = 55634021 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55642243) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 354331 + ... + 354487.

It is an arithmetic number, because the mean of its divisors is an integer number (2679285).

Almost surely, 2^55642213 is an apocalyptic number.

It is an amenable number.

55642213 is a deficient number, since it is larger than the sum of its proper divisors (8660627).

55642213 is a wasteful number, since it uses less digits than its factorization.

55642213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 298 counting only the distinct ones).

The product of its digits is 7200, while the sum is 28.

The square root of 55642213 is about 7459.3708179712. The cubic root of 55642213 is about 381.7697071405.

Adding to 55642213 its reverse (31224655), we get a palindrome (86866868).

It can be divided in two parts, 55642 and 213, that added together give a palindrome (55855).

The spelling of 55642213 in words is "fifty-five million, six hundred forty-two thousand, two hundred thirteen".