55332540 has 72 divisors (see below), whose sum is σ = 170181648. Its totient is φ = 14549760.

The previous prime is 55332539. The next prime is 55332559. The reversal of 55332540 is 4523355.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11035 + ... + 15245.

It is an arithmetic number, because the mean of its divisors is an integer number (2363634).

Almost surely, 2^55332540 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 55332540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85090824).

55332540 is an abundant number, since it is smaller than the sum of its proper divisors (114849108).

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

55332540 is a wasteful number, since it uses less digits than its factorization.

55332540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299 (or 4294 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 27.

The square root of 55332540 is about 7438.5845427743. The cubic root of 55332540 is about 381.0601512900.

Adding to 55332540 its reverse (4523355), we get a palindrome (59855895).

The spelling of 55332540 in words is "fifty-five million, three hundred thirty-two thousand, five hundred forty".