28146778675 has 12 divisors (see below), whose sum is σ = 36105523920. Its totient is φ = 21740959520.

The previous prime is 28146778669. The next prime is 28146778697. The reversal of 28146778675 is 57687764182.

It is not a de Polignac number, because 28146778675 - 2⁷ = 28146778547 is a prime.

It is a super-2 number, since 2×28146778675² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19410847 + ... + 19412296.

It is an arithmetic number, because the mean of its divisors is an integer number (3008793660).

Almost surely, 2^28146778675 is an apocalyptic number.

28146778675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28146778675 is a deficient number, since it is larger than the sum of its proper divisors (7958745245).

28146778675 is a wasteful number, since it uses less digits than its factorization.

28146778675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38823182 (or 38823177 counting only the distinct ones).

The product of its digits is 31610880, while the sum is 61.

The spelling of 28146778675 in words is "twenty-eight billion, one hundred forty-six million, seven hundred seventy-eight thousand, six hundred seventy-five".