28545275178 has 128 divisors (see below), whose sum is σ = 77153472000. Its totient is φ = 7636737024.

The previous prime is 28545275167. The next prime is 28545275189. The reversal of 28545275178 is 87157254582.

It is a happy number.

28545275178 is a `hidden beast` number, since 2 + 8 + 545 + 27 + 5 + 1 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (28545275167) and next prime (28545275189).

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

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1254648 + ... + 1277196.

It is an arithmetic number, because the mean of its divisors is an integer number (602761500).

Almost surely, 2^28545275178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28545275178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38576736000).

28545275178 is an abundant number, since it is smaller than the sum of its proper divisors (48608196822).

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

28545275178 is a wasteful number, since it uses less digits than its factorization.

28545275178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22781 (or 22775 counting only the distinct ones).

The product of its digits is 6272000, while the sum is 54.

The spelling of 28545275178 in words is "twenty-eight billion, five hundred forty-five million, two hundred seventy-five thousand, one hundred seventy-eight".