28957478287 has 4 divisors (see below), whose sum is σ = 28960336080. Its totient is φ = 28954620496.

The previous prime is 28957478281. The next prime is 28957478317. The reversal of 28957478287 is 78287475982.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28957478287 - 2³¹ = 26809994639 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 (28957478281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1413643 + ... + 1433980.

It is an arithmetic number, because the mean of its divisors is an integer number (7240084020).

Almost surely, 2^28957478287 is an apocalyptic number.

28957478287 is a deficient number, since it is larger than the sum of its proper divisors (2857793).

28957478287 is a wasteful number, since it uses less digits than its factorization.

28957478287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2857792.

The product of its digits is 126443520, while the sum is 67.

The spelling of 28957478287 in words is "twenty-eight billion, nine hundred fifty-seven million, four hundred seventy-eight thousand, two hundred eighty-seven".