55400220 has 48 divisors (see below), whose sum is σ = 172357920. Its totient is φ = 14773248.

The previous prime is 55400203. The next prime is 55400243. The reversal of 55400220 is 2200455.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 55400193 and 55400202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50757 + ... + 51836.

It is an arithmetic number, because the mean of its divisors is an integer number (3590790).

Almost surely, 2^55400220 is an apocalyptic number.

It is an amenable number.

55400220 is an abundant number, since it is smaller than the sum of its proper divisors (116957700).

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

55400220 is a wasteful number, since it uses less digits than its factorization.

55400220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102611 (or 102603 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 55400220 is about 7443.1324051101. The cubic root of 55400220 is about 381.2154525714.

Adding to 55400220 its reverse (2200455), we get a palindrome (57600675).

The spelling of 55400220 in words is "fifty-five million, four hundred thousand, two hundred twenty".