55105640 has 32 divisors (see below), whose sum is σ = 127015560. Its totient is φ = 21504000.

The previous prime is 55105627. The next prime is 55105651. The reversal of 55105640 is 4650155.

It can be written as a sum of positive squares in 4 ways, for example, as 11519236 + 43586404 = 3394^2 + 6602^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15161 + ... + 18440.

Almost surely, 2^55105640 is an apocalyptic number.

It is an amenable number.

55105640 is an abundant number, since it is smaller than the sum of its proper divisors (71909920).

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

55105640 is a wasteful number, since it uses less digits than its factorization.

55105640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33653 (or 33649 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 55105640 is about 7423.3173177495. The cubic root of 55105640 is about 380.5385715056.

Adding to 55105640 its reverse (4650155), we get a palindrome (59755795).

The spelling of 55105640 in words is "fifty-five million, one hundred five thousand, six hundred forty".