55171800 has 192 divisors, whose sum is σ = 201549600. Its totient is φ = 13824000.

The previous prime is 55171799. The next prime is 55171807. The reversal of 55171800 is 817155.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55171807) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 91500 + ... + 92100.

Almost surely, 2^55171800 is an apocalyptic number.

55171800 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 55171800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100774800).

55171800 is an abundant number, since it is smaller than the sum of its proper divisors (146377800).

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

55171800 is a wasteful number, since it uses less digits than its factorization.

55171800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643 (or 628 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 55171800 is about 7427.7722097544. The cubic root of 55171800 is about 380.6908025233.

Adding to 55171800 its reverse (817155), we get a palindrome (55988955).

The spelling of 55171800 in words is "fifty-five million, one hundred seventy-one thousand, eight hundred".