28265343128 has 32 divisors (see below), whose sum is σ = 57831293520. Its totient is φ = 12844368000.

The previous prime is 28265343109. The next prime is 28265343137. The reversal of 28265343128 is 82134356282.

It is a happy number.

It is a Cunningham number, because it is equal to 168123²-1.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 294218 + ... + 378278.

Almost surely, 2^28265343128 is an apocalyptic number.

It is an amenable number.

28265343128 is an abundant number, since it is smaller than the sum of its proper divisors (29565950392).

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

28265343128 is a wasteful number, since it uses less digits than its factorization.

28265343128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87899 (or 87895 counting only the distinct ones).

The product of its digits is 552960, while the sum is 44.

The spelling of 28265343128 in words is "twenty-eight billion, two hundred sixty-five million, three hundred forty-three thousand, one hundred twenty-eight".