55222400 has 48 divisors (see below), whose sum is σ = 136424490. Its totient is φ = 22087680.

The previous prime is 55222399. The next prime is 55222403. The reversal of 55222400 is 422255.

It can be written as a sum of positive squares in 3 ways, for example, as 24840256 + 30382144 = 4984^2 + 5512^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is not an unprimeable number, because it can be changed into a prime (55222403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5429 + ... + 11828.

Almost surely, 2^55222400 is an apocalyptic number.

55222400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55222400 is an abundant number, since it is smaller than the sum of its proper divisors (81202090).

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

55222400 is a wasteful number, since it uses less digits than its factorization.

55222400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17281 (or 17264 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 55222400 is about 7431.1775648278. The cubic root of 55222400 is about 380.8071486077.

Adding to 55222400 its reverse (422255), we get a palindrome (55644655).

The spelling of 55222400 in words is "fifty-five million, two hundred twenty-two thousand, four hundred".