1555287228 has 144 divisors (see below), whose sum is σ = 4587238656. Its totient is φ = 439073280.

The previous prime is 1555287221. The next prime is 1555287229. The reversal of 1555287228 is 8227825551.

1555287228 is a `hidden beast` number, since 1 + 5 + 552 + 8 + 72 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1555287221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 692275 + ... + 694517.

It is an arithmetic number, because the mean of its divisors is an integer number (31855824).

Almost surely, 2^1555287228 is an apocalyptic number.

1555287228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1555287228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2293619328).

1555287228 is an abundant number, since it is smaller than the sum of its proper divisors (3031951428).

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

1555287228 is a wasteful number, since it uses less digits than its factorization.

1555287228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2384 (or 2379 counting only the distinct ones).

The product of its digits is 448000, while the sum is 45.

The square root of 1555287228 is about 39437.1300679956. The cubic root of 1555287228 is about 1158.6089220549.

The spelling of 1555287228 in words is "one billion, five hundred fifty-five million, two hundred eighty-seven thousand, two hundred twenty-eight".