28531457258 has 4 divisors (see below), whose sum is σ = 42797185890. Its totient is φ = 14265728628.

The previous prime is 28531457233. The next prime is 28531457267. The reversal of 28531457258 is 85275413582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 85275413582 = 2 ⋅42637706791.

It can be written as a sum of positive squares in only one way, i.e., 22877470009 + 5653987249 = 151253^2 + 75193^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7132864313 + ... + 7132864316.

Almost surely, 2^28531457258 is an apocalyptic number.

28531457258 is a deficient number, since it is larger than the sum of its proper divisors (14265728632).

28531457258 is a wasteful number, since it uses less digits than its factorization.

28531457258 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14265728631.

The product of its digits is 2688000, while the sum is 50.

The spelling of 28531457258 in words is "twenty-eight billion, five hundred thirty-one million, four hundred fifty-seven thousand, two hundred fifty-eight".