55784517 has 8 divisors (see below), whose sum is σ = 74419296. Its totient is φ = 37169712.

The previous prime is 55784503. The next prime is 55784539. The reversal of 55784517 is 71548755.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55784517 - 2⁴ = 55784501 is a prime.

It is a super-2 number, since 2×55784517² = 6223824673846578, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55784587) 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, 3678 + ... + 11184.

It is an arithmetic number, because the mean of its divisors is an integer number (9302412).

Almost surely, 2^55784517 is an apocalyptic number.

It is an amenable number.

55784517 is a deficient number, since it is larger than the sum of its proper divisors (18634779).

55784517 is a wasteful number, since it uses less digits than its factorization.

55784517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9987.

The product of its digits is 196000, while the sum is 42.

The square root of 55784517 is about 7468.9033331541. The cubic root of 55784517 is about 382.0948865647.

The spelling of 55784517 in words is "fifty-five million, seven hundred eighty-four thousand, five hundred seventeen".