55500240 has 160 divisors (see below), whose sum is σ = 185988096. Its totient is φ = 13639680.

The previous prime is 55500239. The next prime is 55500283. The reversal of 55500240 is 4200555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 248769 + ... + 248991.

Almost surely, 2^55500240 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 55500240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92994048).

55500240 is an abundant number, since it is smaller than the sum of its proper divisors (130487856).

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

55500240 is a wasteful number, since it uses less digits than its factorization.

55500240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 55500240 is about 7449.8483206036. The cubic root of 55500240 is about 381.4447311213. Note that the first 3 decimals are identical.

Adding to 55500240 its reverse (4200555), we get a palindrome (59700795).

The spelling of 55500240 in words is "fifty-five million, five hundred thousand, two hundred forty".