55200000 has 216 divisors, whose sum is σ = 191612736. Its totient is φ = 14080000.

The previous prime is 55199993. The next prime is 55200007. The reversal of 55200000 is 255.

It is an interprime number because it is at equal distance from previous prime (55199993) and next prime (55200007).

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (55200007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2399989 + ... + 2400011.

It is an arithmetic number, because the mean of its divisors is an integer number (887096).

Almost surely, 2^55200000 is an apocalyptic number.

55200000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95806368).

55200000 is an abundant number, since it is smaller than the sum of its proper divisors (136412736).

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

55200000 is an frugal number, since it uses more digits than its factorization.

55200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67 (or 33 counting only the distinct ones).

The product of its (nonzero) digits is 50, while the sum is 12.

The square root of 55200000 is about 7429.6702484027. The cubic root of 55200000 is about 380.7556523927.

Adding to 55200000 its reverse (255), we get a palindrome (55200255).

The spelling of 55200000 in words is "fifty-five million, two hundred thousand".