55116720 has 320 divisors, whose sum is σ = 214272000. Its totient is φ = 12939264.

The previous prime is 55116709. The next prime is 55116727. The reversal of 55116720 is 2761155.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (55116727) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 697641 + ... + 697719.

It is an arithmetic number, because the mean of its divisors is an integer number (669600).

Almost surely, 2^55116720 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 55116720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107136000).

55116720 is an abundant number, since it is smaller than the sum of its proper divisors (159155280).

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

55116720 is a wasteful number, since it uses less digits than its factorization.

55116720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 2100, while the sum is 27.

The square root of 55116720 is about 7424.0635773140. The cubic root of 55116720 is about 380.5640745503.

Adding to 55116720 its reverse (2761155), we get a palindrome (57877875).

It can be divided in two parts, 551 and 16720, that added together give a palindrome (17271).

The spelling of 55116720 in words is "fifty-five million, one hundred sixteen thousand, seven hundred twenty".