55204840 has 32 divisors (see below), whose sum is σ = 124987680. Its totient is φ = 21943872.

The previous prime is 55204813. The next prime is 55204847. The reversal of 55204840 is 4840255.

It is a junction number, because it is equal to n+sod(n) for n = 55204799 and 55204808.

It is not an unprimeable number, because it can be changed into a prime (55204847) 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, 2287 + ... + 10753.

It is an arithmetic number, because the mean of its divisors is an integer number (3905865).

Almost surely, 2^55204840 is an apocalyptic number.

It is an amenable number.

55204840 is an abundant number, since it is smaller than the sum of its proper divisors (69782840).

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

55204840 is a wasteful number, since it uses less digits than its factorization.

55204840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8641 (or 8637 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

The square root of 55204840 is about 7429.9959623138. The cubic root of 55204840 is about 380.7667804331.

The spelling of 55204840 in words is "fifty-five million, two hundred four thousand, eight hundred forty".