28156228038 has 12 divisors (see below), whose sum is σ = 61005160788. Its totient is φ = 9385409340.

The previous prime is 28156228033. The next prime is 28156228039. The reversal of 28156228038 is 83082265182.

28156228038 is a `hidden beast` number, since 2 + 8 + 1 + 562 + 2 + 80 + 3 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28156227984 and 28156228002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28156228031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 782117428 + ... + 782117463.

It is an arithmetic number, because the mean of its divisors is an integer number (5083763399).

Almost surely, 2^28156228038 is an apocalyptic number.

28156228038 is an abundant number, since it is smaller than the sum of its proper divisors (32848932750).

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

28156228038 is a wasteful number, since it uses less digits than its factorization.

28156228038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1564234899 (or 1564234896 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The spelling of 28156228038 in words is "twenty-eight billion, one hundred fifty-six million, two hundred twenty-eight thousand, thirty-eight".