55111720 has 16 divisors (see below), whose sum is σ = 124001460. Its totient is φ = 22044672.

The previous prime is 55111717. The next prime is 55111733. The reversal of 55111720 is 2711155.

It can be written as a sum of positive squares in 2 ways, for example, as 54493924 + 617796 = 7382^2 + 786^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55111691 and 55111700.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688857 + ... + 688936.

Almost surely, 2^55111720 is an apocalyptic number.

It is an amenable number.

55111720 is an abundant number, since it is smaller than the sum of its proper divisors (68889740).

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

55111720 is a wasteful number, since it uses less digits than its factorization.

55111720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377804 (or 1377800 counting only the distinct ones).

The product of its (nonzero) digits is 350, while the sum is 22.

The square root of 55111720 is about 7423.7268268707. The cubic root of 55111720 is about 380.5525663794.

Adding to 55111720 its reverse (2711155), we get a palindrome (57822875).

The spelling of 55111720 in words is "fifty-five million, one hundred eleven thousand, seven hundred twenty".