28278565425 has 96 divisors (see below), whose sum is σ = 60005266560. Its totient is φ = 12904243200.

The previous prime is 28278565373. The next prime is 28278565433. The reversal of 28278565425 is 52456587282.

28278565425 is a `hidden beast` number, since 2 + 8 + 2 + 78 + 565 + 4 + 2 + 5 = 666.

It is not a de Polignac number, because 28278565425 - 2⁹ = 28278564913 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14209 + ... + 238241.

It is an arithmetic number, because the mean of its divisors is an integer number (625054860).

Almost surely, 2^28278565425 is an apocalyptic number.

28278565425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28278565425 is an abundant number, since it is smaller than the sum of its proper divisors (31726701135).

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

28278565425 is a wasteful number, since it uses less digits than its factorization.

28278565425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224080 (or 224069 counting only the distinct ones).

The product of its digits is 10752000, while the sum is 54.

The spelling of 28278565425 in words is "twenty-eight billion, two hundred seventy-eight million, five hundred sixty-five thousand, four hundred twenty-five".