15551228 has 36 divisors (see below), whose sum is σ = 34540632. Its totient is φ = 6058080.

The previous prime is 15551213. The next prime is 15551231. The reversal of 15551228 is 82215551.

It is a self number, because there is not a number n which added to its sum of digits gives 15551228.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1451 + ... + 5762.

It is an arithmetic number, because the mean of its divisors is an integer number (959462).

Almost surely, 2^15551228 is an apocalyptic number.

It is an amenable number.

15551228 is an abundant number, since it is smaller than the sum of its proper divisors (18989404).

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

15551228 is a wasteful number, since it uses less digits than its factorization.

15551228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7242 (or 7233 counting only the distinct ones).

The product of its digits is 4000, while the sum is 29.

The square root of 15551228 is about 3943.5045327728. The cubic root of 15551228 is about 249.6059284903.

Adding to 15551228 its reverse (82215551), we get a palindrome (97766779).

The spelling of 15551228 in words is "fifteen million, five hundred fifty-one thousand, two hundred twenty-eight".