55865540 has 12 divisors (see below), whose sum is σ = 117317676. Its totient is φ = 22346208.

The previous prime is 55865539. The next prime is 55865549. The reversal of 55865540 is 4556855.

It can be written as a sum of positive squares in 2 ways, for example, as 15007876 + 40857664 = 3874^2 + 6392^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55865494 and 55865503.

It is not an unprimeable number, because it can be changed into a prime (55865549) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1396619 + ... + 1396658.

It is an arithmetic number, because the mean of its divisors is an integer number (9776473).

Almost surely, 2^55865540 is an apocalyptic number.

It is an amenable number.

55865540 is an abundant number, since it is smaller than the sum of its proper divisors (61452136).

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

55865540 is a wasteful number, since it uses less digits than its factorization.

55865540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2793286 (or 2793284 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 38.

The square root of 55865540 is about 7474.3253876186. The cubic root of 55865540 is about 382.2797855260.

The spelling of 55865540 in words is "fifty-five million, eight hundred sixty-five thousand, five hundred forty".