55681648 has 20 divisors (see below), whose sum is σ = 117691128.
Its totient is φ = 25309760.
The previous prime is 55681631. The next prime is 55681721. The reversal of 55681648 is 84618655.
It is a super-5 number, since 5×556816485 (a number of 40 digits) contains 55555 as substring.
It is a congruent number.
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 3 ways as a sum of consecutive naturals, for example, 158011 + ... + 158362.
Almost surely, 255681648 is an apocalyptic number.
It is an amenable number.
55681648 is an abundant number, since it is smaller than the sum of its proper divisors (62009480).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
55681648 is a wasteful number, since it uses less digits than its factorization.
55681648 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 316392 (or 316386 counting only the distinct ones).
The product of its digits is 230400, while the sum is 43.
The square root of 55681648 is about 7462.0136692451.
The cubic root of 55681648 is about 381.8598756916.
The spelling of 55681648 in words is "fifty-five million, six hundred eighty-one thousand, six hundred forty-eight".