28135286550 has 384 divisors, whose sum is σ = 92433607680. Its totient is φ = 6158592000.

The previous prime is 28135286453. The next prime is 28135286573. The reversal of 28135286550 is 5568253182.

28135286550 is a `hidden beast` number, since 2 + 8 + 13 + 5 + 2 + 86 + 550 = 666.

It is a super-2 number, since 2×28135286550² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 28135286496 and 28135286505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 23425950 + ... + 23427150.

It is an arithmetic number, because the mean of its divisors is an integer number (240712520).

Almost surely, 2^28135286550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28135286550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46216803840).

28135286550 is an abundant number, since it is smaller than the sum of its proper divisors (64298321130).

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

28135286550 is a wasteful number, since it uses less digits than its factorization.

28135286550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333 (or 1322 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 45.

The spelling of 28135286550 in words is "twenty-eight billion, one hundred thirty-five million, two hundred eighty-six thousand, five hundred fifty".