55545400 has 48 divisors (see below), whose sum is σ = 129902400. Its totient is φ = 22087680.

The previous prime is 55545389. The next prime is 55545403. The reversal of 55545400 is 454555.

It is a super-2 number, since 2×55545400² = 6170582922320000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55545403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37881 + ... + 39319.

It is an arithmetic number, because the mean of its divisors is an integer number (2706300).

Almost surely, 2^55545400 is an apocalyptic number.

55545400 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 55545400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64951200).

55545400 is an abundant number, since it is smaller than the sum of its proper divisors (74357000).

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

55545400 is a wasteful number, since it uses less digits than its factorization.

55545400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1648 (or 1639 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 55545400 is about 7452.8786384859. The cubic root of 55545400 is about 381.5481623494.

Adding to 55545400 its reverse (454555), we get a palindrome (55999955).

It can be divided in two parts, 55545 and 400, that added together give a triangular number (55945 = T₃₃₄).

The spelling of 55545400 in words is "fifty-five million, five hundred forty-five thousand, four hundred".