55125440 has 56 divisors (see below), whose sum is σ = 135526272. Its totient is φ = 21335040.

The previous prime is 55125431. The next prime is 55125451. The reversal of 55125440 is 4452155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7142 + ... + 12698.

It is an arithmetic number, because the mean of its divisors is an integer number (2420112).

Almost surely, 2^55125440 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 55125440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67763136).

55125440 is an abundant number, since it is smaller than the sum of its proper divisors (80400832).

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

55125440 is a wasteful number, since it uses less digits than its factorization.

55125440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5605 (or 5595 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 55125440 is about 7424.6508335409. The cubic root of 55125440 is about 380.5841431353.

Adding to 55125440 its reverse (4452155), we get a palindrome (59577595).

The spelling of 55125440 in words is "fifty-five million, one hundred twenty-five thousand, four hundred forty".