55145240 has 64 divisors (see below), whose sum is σ = 129664800. Its totient is φ = 21081088.

The previous prime is 55145213. The next prime is 55145291. The reversal of 55145240 is 4254155.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158747 + ... + 159093.

Almost surely, 2^55145240 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 55145240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64832400).

55145240 is an abundant number, since it is smaller than the sum of its proper divisors (74519560).

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

55145240 is a wasteful number, since it uses less digits than its factorization.

55145240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524 (or 520 counting only the distinct ones).

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

The square root of 55145240 is about 7425.9841098672. The cubic root of 55145240 is about 380.6297038541.

Adding to 55145240 its reverse (4254155), we get a palindrome (59399395).

The spelling of 55145240 in words is "fifty-five million, one hundred forty-five thousand, two hundred forty".