28257930705 has 16 divisors (see below), whose sum is σ = 45215634240. Its totient is φ = 15069914688.

The previous prime is 28257930703. The next prime is 28257930707. The reversal of 28257930705 is 50703975282.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28257930703) and next prime (28257930707).

It is not a de Polignac number, because 28257930705 - 2¹ = 28257930703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28257930703) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217474 + ... + 322196.

It is an arithmetic number, because the mean of its divisors is an integer number (2825977140).

Almost surely, 2^28257930705 is an apocalyptic number.

It is an amenable number.

28257930705 is a deficient number, since it is larger than the sum of its proper divisors (16957703535).

28257930705 is a wasteful number, since it uses less digits than its factorization.

28257930705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122720.

The product of its (nonzero) digits is 1058400, while the sum is 48.

The spelling of 28257930705 in words is "twenty-eight billion, two hundred fifty-seven million, nine hundred thirty thousand, seven hundred five".