55229440 has 176 divisors, whose sum is σ = 160353792. Its totient is φ = 17842176.

The previous prime is 55229437. The next prime is 55229443. The reversal of 55229440 is 4492255.

It is an interprime number because it is at equal distance from previous prime (55229437) and next prime (55229443).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55229443) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 824287 + ... + 824353.

Almost surely, 2^55229440 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 55229440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80176896).

55229440 is an abundant number, since it is smaller than the sum of its proper divisors (105124352).

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

55229440 is a wasteful number, since it uses less digits than its factorization.

55229440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122 (or 104 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 55229440 is about 7431.6512297066. The cubic root of 55229440 is about 380.8233302562.

It can be divided in two parts, 552 and 29440, that added together give a palindrome (29992).

The spelling of 55229440 in words is "fifty-five million, two hundred twenty-nine thousand, four hundred forty".