55320540 has 96 divisors (see below), whose sum is σ = 171279360. Its totient is φ = 13228800.

The previous prime is 55320481. The next prime is 55320541. The reversal of 55320540 is 4502355.

It is a self number, because there is not a number n which added to its sum of digits gives 55320540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55320541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 51610 + ... + 52670.

It is an arithmetic number, because the mean of its divisors is an integer number (1784160).

Almost surely, 2^55320540 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 55320540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85639680).

55320540 is an abundant number, since it is smaller than the sum of its proper divisors (115958820).

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

55320540 is a wasteful number, since it uses less digits than its factorization.

55320540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163 (or 1161 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 55320540 is about 7437.7778939681. Note that the first 3 decimals coincide. The cubic root of 55320540 is about 381.0326023864.

Adding to 55320540 its reverse (4502355), we get a palindrome (59822895).

The spelling of 55320540 in words is "fifty-five million, three hundred twenty thousand, five hundred forty".