55509400 has 24 divisors (see below), whose sum is σ = 129059820. Its totient is φ = 22203680.

The previous prime is 55509379. The next prime is 55509401. The reversal of 55509400 is 490555.

55509400 is nontrivially palindromic in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55509401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 138574 + ... + 138973.

Almost surely, 2^55509400 is an apocalyptic number.

55509400 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

55509400 is an abundant number, since it is smaller than the sum of its proper divisors (73550420).

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

55509400 is a wasteful number, since it uses less digits than its factorization.

55509400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277563 (or 277554 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 28.

The square root of 55509400 is about 7450.4630728566. The cubic root of 55509400 is about 381.4657150638.

Adding to 55509400 its reverse (490555), we get a palindrome (55999955).

The spelling of 55509400 in words is "fifty-five million, five hundred nine thousand, four hundred".