55217904 has 120 divisors (see below), whose sum is σ = 175823568. Its totient is φ = 14837760.

The previous prime is 55217893. The next prime is 55217927. The reversal of 55217904 is 40971255.

55217904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39294 + ... + 40674.

Almost surely, 2^55217904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55217904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87911784).

55217904 is an abundant number, since it is smaller than the sum of its proper divisors (120605664).

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

55217904 is a wasteful number, since it uses less digits than its factorization.

55217904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423 (or 1410 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 33.

The square root of 55217904 is about 7430.8750494138. The cubic root of 55217904 is about 380.7968136988.

The spelling of 55217904 in words is "fifty-five million, two hundred seventeen thousand, nine hundred four".