55565040 has 80 divisors (see below), whose sum is σ = 173703168. Its totient is φ = 14692608.

The previous prime is 55565023. The next prime is 55565071. The reversal of 55565040 is 4056555.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55564989 and 55565007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29569 + ... + 31391.

Almost surely, 2^55565040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55565040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86851584).

55565040 is an abundant number, since it is smaller than the sum of its proper divisors (118138128).

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

55565040 is a wasteful number, since it uses less digits than its factorization.

55565040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1966 (or 1960 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 30.

The square root of 55565040 is about 7454.1961337223. The cubic root of 55565040 is about 381.5931269062.

The spelling of 55565040 in words is "fifty-five million, five hundred sixty-five thousand, forty".