15520443228 has 36 divisors (see below), whose sum is σ = 39366156648. Its totient is φ = 5155820640.

The previous prime is 15520443173. The next prime is 15520443241. The reversal of 15520443228 is 82234402551.

15520443228 is a `hidden beast` number, since 15 + 5 + 204 + 432 + 2 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 15520443192 and 15520443201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 725158 + ... + 746253.

Almost surely, 2^15520443228 is an apocalyptic number.

15520443228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

15520443228 is an abundant number, since it is smaller than the sum of its proper divisors (23845713420).

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

15520443228 is a wasteful number, since it uses less digits than its factorization.

15520443228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471714 (or 1471709 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 36.

Adding to 15520443228 its reverse (82234402551), we get a palindrome (97754845779).

The spelling of 15520443228 in words is "fifteen billion, five hundred twenty million, four hundred forty-three thousand, two hundred twenty-eight".