55421850 has 48 divisors (see below), whose sum is σ = 149945760. Its totient is φ = 13435200.

The previous prime is 55421837. The next prime is 55421851. The reversal of 55421850 is 5812455.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (55421851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15145 + ... + 18444.

It is an arithmetic number, because the mean of its divisors is an integer number (3123870).

Almost surely, 2^55421850 is an apocalyptic number.

55421850 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

55421850 is an abundant number, since it is smaller than the sum of its proper divisors (94523910).

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

55421850 is a wasteful number, since it uses less digits than its factorization.

55421850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33615 (or 33610 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 30.

The square root of 55421850 is about 7444.5852805915. The cubic root of 55421850 is about 381.2650589770.

The spelling of 55421850 in words is "fifty-five million, four hundred twenty-one thousand, eight hundred fifty".