55215200 has 36 divisors (see below), whose sum is σ = 134796060. Its totient is φ = 22085760.

The previous prime is 55215179. The next prime is 55215239. The reversal of 55215200 is 251255.

It is a super-2 number, since 2×55215200² = 6097436622080000, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33710 + ... + 35309.

It is an arithmetic number, because the mean of its divisors is an integer number (3744335).

Almost surely, 2^55215200 is an apocalyptic number.

55215200 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55215200 is an abundant number, since it is smaller than the sum of its proper divisors (79580860).

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

55215200 is a wasteful number, since it uses less digits than its factorization.

55215200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69039 (or 69026 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 20.

The square root of 55215200 is about 7430.6931036075. The cubic root of 55215200 is about 380.7905977718.

Adding to 55215200 its reverse (251255), we get a palindrome (55466455).

The spelling of 55215200 in words is "fifty-five million, two hundred fifteen thousand, two hundred".