55332440 has 32 divisors (see below), whose sum is σ = 125336160. Its totient is φ = 21984000.

The previous prime is 55332413. The next prime is 55332449. The reversal of 55332440 is 4423355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55332449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1460 + ... + 10620.

It is an arithmetic number, because the mean of its divisors is an integer number (3916755).

Almost surely, 2^55332440 is an apocalyptic number.

It is an amenable number.

55332440 is an abundant number, since it is smaller than the sum of its proper divisors (70003720).

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

55332440 is a wasteful number, since it uses less digits than its factorization.

55332440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9323 (or 9319 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 26.

The square root of 55332440 is about 7438.5778210623. The cubic root of 55332440 is about 381.0599217322.

Adding to 55332440 its reverse (4423355), we get a palindrome (59755795).

The spelling of 55332440 in words is "fifty-five million, three hundred thirty-two thousand, four hundred forty".