555221040 has 160 divisors (see below), whose sum is σ = 1976659200. Its totient is φ = 127503360.

The previous prime is 555221033. The next prime is 555221041. The reversal of 555221040 is 40122555.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 555221040.

It is not an unprimeable number, because it can be changed into a prime (555221041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 44626 + ... + 55694.

It is an arithmetic number, because the mean of its divisors is an integer number (12354120).

Almost surely, 2^555221040 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 555221040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (988329600).

555221040 is an abundant number, since it is smaller than the sum of its proper divisors (1421438160).

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

555221040 is a wasteful number, since it uses less digits than its factorization.

555221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11115 (or 11109 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 24.

The square root of 555221040 is about 23563.1288245004. The cubic root of 555221040 is about 821.9056610555.

Adding to 555221040 its reverse (40122555), we get a palindrome (595343595).

The spelling of 555221040 in words is "five hundred fifty-five million, two hundred twenty-one thousand, forty".