55153220 has 12 divisors (see below), whose sum is σ = 115821804. Its totient is φ = 22061280.

The previous prime is 55153213. The next prime is 55153229. The reversal of 55153220 is 2235155.

It can be written as a sum of positive squares in 2 ways, for example, as 20484676 + 34668544 = 4526^2 + 5888^2 .

It is not an unprimeable number, because it can be changed into a prime (55153229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378811 + ... + 1378850.

It is an arithmetic number, because the mean of its divisors is an integer number (9651817).

Almost surely, 2^55153220 is an apocalyptic number.

It is an amenable number.

55153220 is an abundant number, since it is smaller than the sum of its proper divisors (60668584).

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

55153220 is a wasteful number, since it uses less digits than its factorization.

55153220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757670 (or 2757668 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 23.

The square root of 55153220 is about 7426.5213929538. The cubic root of 55153220 is about 380.6480631210.

Adding to 55153220 its reverse (2235155), we get a palindrome (57388375).

The spelling of 55153220 in words is "fifty-five million, one hundred fifty-three thousand, two hundred twenty".