55527220 has 24 divisors (see below), whose sum is σ = 133265664. Its totient is φ = 19037856.

The previous prime is 55527193. The next prime is 55527229. The reversal of 55527220 is 2272555.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55527229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198172 + ... + 198451.

It is an arithmetic number, because the mean of its divisors is an integer number (5552736).

Almost surely, 2^55527220 is an apocalyptic number.

It is an amenable number.

55527220 is an abundant number, since it is smaller than the sum of its proper divisors (77738444).

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

55527220 is a wasteful number, since it uses less digits than its factorization.

55527220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396639 (or 396637 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 28.

The square root of 55527220 is about 7451.6588757135. The cubic root of 55527220 is about 381.5065309241.

Adding to 55527220 its reverse (2272555), we get a palindrome (57799775).

The spelling of 55527220 in words is "fifty-five million, five hundred twenty-seven thousand, two hundred twenty".