55213866 has 32 divisors (see below), whose sum is σ = 123165120. Its totient is φ = 18334512.

The previous prime is 55213853. The next prime is 55213897. The reversal of 55213866 is 66831255.

It is a self number, because there is not a number n which added to its sum of digits gives 55213866.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13476 + ... + 17088.

It is an arithmetic number, because the mean of its divisors is an integer number (3848910).

Almost surely, 2^55213866 is an apocalyptic number.

55213866 is an abundant number, since it is smaller than the sum of its proper divisors (67951254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55213866 is a wasteful number, since it uses less digits than its factorization.

55213866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3907 (or 3901 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 55213866 is about 7430.6033402410. The cubic root of 55213866 is about 380.7875311117.

The spelling of 55213866 in words is "fifty-five million, two hundred thirteen thousand, eight hundred sixty-six".