55684220 has 24 divisors (see below), whose sum is σ = 117319104. Its totient is φ = 22200896.

The previous prime is 55684207. The next prime is 55684243. The reversal of 55684220 is 2248655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1949 + ... + 10731.

It is an arithmetic number, because the mean of its divisors is an integer number (4888296).

Almost surely, 2^55684220 is an apocalyptic number.

It is an amenable number.

55684220 is an abundant number, since it is smaller than the sum of its proper divisors (61634884).

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

55684220 is a wasteful number, since it uses less digits than its factorization.

55684220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9109 (or 9107 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 32.

The square root of 55684220 is about 7462.1860067945. The cubic root of 55684220 is about 381.8657551181.

It can be divided in two parts, 556842 and 20, that multiplied together give a triangular number (11136840 = T₄₇₁₉).

The spelling of 55684220 in words is "fifty-five million, six hundred eighty-four thousand, two hundred twenty".