28078308275 has 12 divisors (see below), whose sum is σ = 35009467584. Its totient is φ = 22338540000.

The previous prime is 28078308257. The next prime is 28078308277. The reversal of 28078308275 is 57280387082.

It is not a de Polignac number, because 28078308275 - 2²⁰ = 28077259699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078308277) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3098051 + ... + 3107100.

It is an arithmetic number, because the mean of its divisors is an integer number (2917455632).

Almost surely, 2^28078308275 is an apocalyptic number.

28078308275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28078308275 is a deficient number, since it is larger than the sum of its proper divisors (6931159309).

28078308275 is a wasteful number, since it uses less digits than its factorization.

28078308275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6205342 (or 6205337 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 50.

The spelling of 28078308275 in words is "twenty-eight billion, seventy-eight million, three hundred eight thousand, two hundred seventy-five".