55330400 has 36 divisors (see below), whose sum is σ = 135077292. Its totient is φ = 22131840.

The previous prime is 55330399. The next prime is 55330439. The reversal of 55330400 is 403355.

It is a super-2 number, since 2×55330400² = 6122906328320000, 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, 33782 + ... + 35381.

It is an arithmetic number, because the mean of its divisors is an integer number (3752147).

Almost surely, 2^55330400 is an apocalyptic number.

55330400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55330400 is an abundant number, since it is smaller than the sum of its proper divisors (79746892).

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

55330400 is a wasteful number, since it uses less digits than its factorization.

55330400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69183 (or 69170 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 20.

The square root of 55330400 is about 7438.4406968127. The cubic root of 55330400 is about 381.0552386940.

Adding to 55330400 its reverse (403355), we get a palindrome (55733755).

The spelling of 55330400 in words is "fifty-five million, three hundred thirty thousand, four hundred".