55643500 has 96 divisors (see below), whose sum is σ = 135442944. Its totient is φ = 19800000.

The previous prime is 55643461. The next prime is 55643503. The reversal of 55643500 is 534655.

It is not an unprimeable number, because it can be changed into a prime (55643503) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 368425 + ... + 368575.

It is an arithmetic number, because the mean of its divisors is an integer number (1410864).

Almost surely, 2^55643500 is an apocalyptic number.

55643500 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 55643500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67721472).

55643500 is an abundant number, since it is smaller than the sum of its proper divisors (79799444).

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

55643500 is a wasteful number, since it uses less digits than its factorization.

55643500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248 (or 236 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 28.

The square root of 55643500 is about 7459.4570848018. The cubic root of 55643500 is about 381.7726505523.

The spelling of 55643500 in words is "fifty-five million, six hundred forty-three thousand, five hundred".