55643000 has 64 divisors (see below), whose sum is σ = 148824000. Its totient is φ = 19075200.

The previous prime is 55642997. The next prime is 55643017. The reversal of 55643000 is 34655.

It is a super-2 number, since 2×55643000² = 6192286898000000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3026 + ... + 10974.

It is an arithmetic number, because the mean of its divisors is an integer number (2325375).

Almost surely, 2^55643000 is an apocalyptic number.

55643000 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 55643000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74412000).

55643000 is an abundant number, since it is smaller than the sum of its proper divisors (93181000).

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

55643000 is a wasteful number, since it uses less digits than its factorization.

55643000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7977 (or 7963 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 55643000 is about 7459.4235702231. The cubic root of 55643000 is about 381.7715070411.

Adding to 55643000 its reverse (34655), we get a palindrome (55677655).

The spelling of 55643000 in words is "fifty-five million, six hundred forty-three thousand".