55051720 has 32 divisors (see below), whose sum is σ = 125971200. Its totient is φ = 21646528.

The previous prime is 55051687. The next prime is 55051727. The reversal of 55051720 is 2715055.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55051727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9304 + ... + 14023.

It is an arithmetic number, because the mean of its divisors is an integer number (3936600).

Almost surely, 2^55051720 is an apocalyptic number.

It is an amenable number.

55051720 is an abundant number, since it is smaller than the sum of its proper divisors (70919480).

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

55051720 is a wasteful number, since it uses less digits than its factorization.

55051720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23397 (or 23393 counting only the distinct ones).

The product of its (nonzero) digits is 1750, while the sum is 25.

The square root of 55051720 is about 7419.6846294165. The cubic root of 55051720 is about 380.4144140037.

Adding to 55051720 its reverse (2715055), we get a palindrome (57766775).

It can be divided in two parts, 5505 and 1720, that added together give a square (7225 = 85²).

The spelling of 55051720 in words is "fifty-five million, fifty-one thousand, seven hundred twenty".