55891000 has 64 divisors (see below), whose sum is σ = 142702560. Its totient is φ = 20320000.

The previous prime is 55890997. The next prime is 55891001. The reversal of 55891000 is 19855.

It is a self number, because there is not a number n which added to its sum of digits gives 55891000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55891001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8460 + ... + 13540.

Almost surely, 2^55891000 is an apocalyptic number.

55891000 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 55891000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71351280).

55891000 is an abundant number, since it is smaller than the sum of its proper divisors (86811560).

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

55891000 is a wasteful number, since it uses less digits than its factorization.

55891000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5113 (or 5099 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 55891000 is about 7476.0283573566. The cubic root of 55891000 is about 382.3378497350.

The spelling of 55891000 in words is "fifty-five million, eight hundred ninety-one thousand".