55841640 has 64 divisors (see below), whose sum is σ = 171106560. Its totient is φ = 14572800.

The previous prime is 55841579. The next prime is 55841647. The reversal of 55841640 is 4614855.

It is not an unprimeable number, because it can be changed into a prime (55841647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 690 + ... + 10590.

It is an arithmetic number, because the mean of its divisors is an integer number (2673540).

Almost surely, 2^55841640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55841640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85553280).

55841640 is an abundant number, since it is smaller than the sum of its proper divisors (115264920).

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

55841640 is a wasteful number, since it uses less digits than its factorization.

55841640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9962 (or 9958 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 33.

The square root of 55841640 is about 7472.7264100862. The cubic root of 55841640 is about 382.2252630059.

The spelling of 55841640 in words is "fifty-five million, eight hundred forty-one thousand, six hundred forty".