55008720 has 200 divisors, whose sum is σ = 206064936. Its totient is φ = 13519872.

The previous prime is 55008689. The next prime is 55008721. The reversal of 55008720 is 2780055.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11664 + 54997056 = 108^2 + 7416^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55008721) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 83914 + ... + 84566.

Almost surely, 2^55008720 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 55008720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103032468).

55008720 is an abundant number, since it is smaller than the sum of its proper divisors (151056216).

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

55008720 is a wasteful number, since it uses less digits than its factorization.

55008720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 55008720 is about 7416.7863660753. The cubic root of 55008720 is about 380.3153430416.

Adding to 55008720 its reverse (2780055), we get a palindrome (57788775).

The spelling of 55008720 in words is "fifty-five million, eight thousand, seven hundred twenty".