55648240 has 20 divisors (see below), whose sum is σ = 129382344. Its totient is φ = 22259264.

The previous prime is 55648237. The next prime is 55648249. The reversal of 55648240 is 4284655.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 55648196 and 55648205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55648249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 347722 + ... + 347881.

Almost surely, 2^55648240 is an apocalyptic number.

It is an amenable number.

55648240 is an abundant number, since it is smaller than the sum of its proper divisors (73734104).

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

55648240 is a wasteful number, since it uses less digits than its factorization.

55648240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695616 (or 695610 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 34.

The square root of 55648240 is about 7459.7747955283. The cubic root of 55648240 is about 381.7834906982.

The spelling of 55648240 in words is "fifty-five million, six hundred forty-eight thousand, two hundred forty".