55784565 has 64 divisors (see below), whose sum is σ = 106444800. Its totient is φ = 27620352.

The previous prime is 55784543. The next prime is 55784581. The reversal of 55784565 is 56548755.

55784565 is a `hidden beast` number, since 5 + 5 + 7 + 84 + 565 = 666.

It is not a de Polignac number, because 55784565 - 2⁶ = 55784501 is a prime.

It is a super-2 number, since 2×55784565² = 6223835384478450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 55784565.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 250044 + ... + 250266.

It is an arithmetic number, because the mean of its divisors is an integer number (1663200).

Almost surely, 2^55784565 is an apocalyptic number.

It is an amenable number.

55784565 is a deficient number, since it is larger than the sum of its proper divisors (50660235).

55784565 is a wasteful number, since it uses less digits than its factorization.

55784565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363 (or 357 counting only the distinct ones).

The product of its digits is 840000, while the sum is 45.

The square root of 55784565 is about 7468.9065464765. The cubic root of 55784565 is about 382.0949961563.

The spelling of 55784565 in words is "fifty-five million, seven hundred eighty-four thousand, five hundred sixty-five".