55317120 has 128 divisors (see below), whose sum is σ = 180368640. Its totient is φ = 14413824.

The previous prime is 55317103. The next prime is 55317121. The reversal of 55317120 is 2171355.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (55317121) 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, 89934 + ... + 90546.

It is an arithmetic number, because the mean of its divisors is an integer number (1409130).

Almost surely, 2^55317120 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 55317120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90184320).

55317120 is an abundant number, since it is smaller than the sum of its proper divisors (125051520).

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

55317120 is a wasteful number, since it uses less digits than its factorization.

55317120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 24.

The square root of 55317120 is about 7437.5479830385. The cubic root of 55317120 is about 381.0247502194.

Adding to 55317120 its reverse (2171355), we get a palindrome (57488475).

The spelling of 55317120 in words is "fifty-five million, three hundred seventeen thousand, one hundred twenty".