55312240 has 60 divisors (see below), whose sum is σ = 134538264. Its totient is φ = 21146752.

The previous prime is 55312189. The next prime is 55312267. The reversal of 55312240 is 4221355.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41667 + ... + 42973.

Almost surely, 2^55312240 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 55312240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67269132).

55312240 is an abundant number, since it is smaller than the sum of its proper divisors (79226024).

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

55312240 is a wasteful number, since it uses less digits than its factorization.

55312240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1366 (or 1337 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 55312240 is about 7437.2199106924. The cubic root of 55312240 is about 381.0135453974.

Adding to 55312240 its reverse (4221355), we get a palindrome (59533595).

The spelling of 55312240 in words is "fifty-five million, three hundred twelve thousand, two hundred forty".