28287155556 has 192 divisors, whose sum is σ = 81192222720. Its totient is φ = 8445600000.

The previous prime is 28287155551. The next prime is 28287155569. The reversal of 28287155556 is 65555178282.

28287155556 is a `hidden beast` number, since 2 + 8 + 2 + 87 + 1 + 5 + 5 + 556 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (28287155551) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24575581 + ... + 24576731.

It is an arithmetic number, because the mean of its divisors is an integer number (422876160).

Almost surely, 2^28287155556 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 28287155556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40596111360).

28287155556 is an abundant number, since it is smaller than the sum of its proper divisors (52905067164).

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

28287155556 is a wasteful number, since it uses less digits than its factorization.

28287155556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1463 (or 1455 counting only the distinct ones).

The product of its digits is 6720000, while the sum is 54.

The spelling of 28287155556 in words is "twenty-eight billion, two hundred eighty-seven million, one hundred fifty-five thousand, five hundred fifty-six".