28345278357 has 24 divisors (see below), whose sum is σ = 44725842720. Its totient is φ = 17155666080.

The previous prime is 28345278347. The next prime is 28345278391. The reversal of 28345278357 is 75387254382.

28345278357 is a `hidden beast` number, since 2 + 8 + 34 + 527 + 83 + 5 + 7 = 666.

It is not a de Polignac number, because 28345278357 - 2⁶ = 28345278293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28345278347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120558 + ... + 266879.

It is an arithmetic number, because the mean of its divisors is an integer number (1863576780).

Almost surely, 2^28345278357 is an apocalyptic number.

It is an amenable number.

28345278357 is a deficient number, since it is larger than the sum of its proper divisors (16380564363).

28345278357 is a wasteful number, since it uses less digits than its factorization.

28345278357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388193 (or 388190 counting only the distinct ones).

The product of its digits is 11289600, while the sum is 54.

The spelling of 28345278357 in words is "twenty-eight billion, three hundred forty-five million, two hundred seventy-eight thousand, three hundred fifty-seven".