28345009375 has 12 divisors (see below), whose sum is σ = 35428998024. Its totient is φ = 22676005000.

The previous prime is 28345009351. The next prime is 28345009379. The reversal of 28345009375 is 57390054382.

It is not a de Polignac number, because 28345009375 - 2²¹ = 28342912223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28345009379) 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, 4532077 + ... + 4538326.

It is an arithmetic number, because the mean of its divisors is an integer number (2952416502).

Almost surely, 2^28345009375 is an apocalyptic number.

28345009375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28345009375 is a deficient number, since it is larger than the sum of its proper divisors (7083988649).

28345009375 is an frugal number, since it uses more digits than its factorization.

28345009375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9070428 (or 9070408 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 46.

The spelling of 28345009375 in words is "twenty-eight billion, three hundred forty-five million, nine thousand, three hundred seventy-five".