55643210 has 128 divisors (see below), whose sum is σ = 134369280. Its totient is φ = 16118784.

The previous prime is 55643209. The next prime is 55643213. The reversal of 55643210 is 1234655.

It is a self number, because there is not a number n which added to its sum of digits gives 55643210.

It is not an unprimeable number, because it can be changed into a prime (55643213) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 519977 + ... + 520083.

It is an arithmetic number, because the mean of its divisors is an integer number (1049760).

Almost surely, 2^55643210 is an apocalyptic number.

55643210 is an abundant number, since it is smaller than the sum of its proper divisors (78726070).

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

55643210 is a wasteful number, since it uses less digits than its factorization.

55643210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180.

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 55643210 is about 7459.4376463645. The cubic root of 55643210 is about 381.7719873166.

Adding to 55643210 its reverse (1234655), we get a palindrome (56877865).

The spelling of 55643210 in words is "fifty-five million, six hundred forty-three thousand, two hundred ten".