55351320 has 128 divisors (see below), whose sum is σ = 180195840. Its totient is φ = 13547520.

The previous prime is 55351319. The next prime is 55351321. The reversal of 55351320 is 2315355.

It is an interprime number because it is at equal distance from previous prime (55351319) and next prime (55351321).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55351321) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87405 + ... + 88035.

It is an arithmetic number, because the mean of its divisors is an integer number (1407780).

Almost surely, 2^55351320 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 55351320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90097920).

55351320 is an abundant number, since it is smaller than the sum of its proper divisors (124844520).

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

55351320 is a wasteful number, since it uses less digits than its factorization.

55351320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 705 (or 701 counting only the distinct ones).

The product of its (nonzero) digits is 2250, while the sum is 24.

The square root of 55351320 is about 7439.8467726157. The cubic root of 55351320 is about 381.1032573307.

Adding to 55351320 its reverse (2315355), we get a palindrome (57666675).

The spelling of 55351320 in words is "fifty-five million, three hundred fifty-one thousand, three hundred twenty".