55225840 has 20 divisors (see below), whose sum is σ = 128400264. Its totient is φ = 22090304.

The previous prime is 55225817. The next prime is 55225847. The reversal of 55225840 is 4852255.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55225847) 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, 345082 + ... + 345241.

Almost surely, 2^55225840 is an apocalyptic number.

It is an amenable number.

55225840 is an abundant number, since it is smaller than the sum of its proper divisors (73174424).

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

55225840 is a wasteful number, since it uses less digits than its factorization.

55225840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690336 (or 690330 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

The square root of 55225840 is about 7431.4090184836. The cubic root of 55225840 is about 380.8150557214.

It can be divided in two parts, 55225 and 840, that added together give a palindrome (56065).

The spelling of 55225840 in words is "fifty-five million, two hundred twenty-five thousand, eight hundred forty".