55145100 has 72 divisors (see below), whose sum is σ = 162989568. Its totient is φ = 14388800.

The previous prime is 55145071. The next prime is 55145137. The reversal of 55145100 is 154155.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12145 + ... + 16055.

It is an arithmetic number, because the mean of its divisors is an integer number (2263744).

Almost surely, 2^55145100 is an apocalyptic number.

55145100 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 55145100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81494784).

55145100 is an abundant number, since it is smaller than the sum of its proper divisors (107844468).

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

55145100 is a wasteful number, since it uses less digits than its factorization.

55145100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3975 (or 3968 counting only the distinct ones).

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 55145100 is about 7425.9746835011. The cubic root of 55145100 is about 380.6293817459.

Adding to 55145100 its reverse (154155), we get a palindrome (55299255).

The spelling of 55145100 in words is "fifty-five million, one hundred forty-five thousand, one hundred".