55591506 has 48 divisors (see below), whose sum is σ = 128404224. Its totient is φ = 17341632.

The previous prime is 55591489. The next prime is 55591507. The reversal of 55591506 is 60519555.

It is not an unprimeable number, because it can be changed into a prime (55591507) 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, 18030 + ... + 20886.

It is an arithmetic number, because the mean of its divisors is an integer number (2675088).

Almost surely, 2^55591506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55591506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64202112).

55591506 is an abundant number, since it is smaller than the sum of its proper divisors (72812718).

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

55591506 is a wasteful number, since it uses less digits than its factorization.

55591506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2935 (or 2932 counting only the distinct ones).

The product of its (nonzero) digits is 33750, while the sum is 36.

The square root of 55591506 is about 7455.9711641073. The cubic root of 55591506 is about 381.6537024088.

The spelling of 55591506 in words is "fifty-five million, five hundred ninety-one thousand, five hundred six".