28979683858 has 4 divisors (see below), whose sum is σ = 43469525790. Its totient is φ = 14489841928.

The previous prime is 28979683801. The next prime is 28979683871. The reversal of 28979683858 is 85838697982.

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

It can be written as a sum of positive squares in only one way, i.e., 27603496449 + 1376187409 = 166143^2 + 37097^2 .

It is a super-3 number, since 3×28979683858³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7244920963 + ... + 7244920966.

Almost surely, 2^28979683858 is an apocalyptic number.

28979683858 is a deficient number, since it is larger than the sum of its proper divisors (14489841932).

28979683858 is a wasteful number, since it uses less digits than its factorization.

28979683858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14489841931.

The product of its digits is 418037760, while the sum is 73.

The spelling of 28979683858 in words is "twenty-eight billion, nine hundred seventy-nine million, six hundred eighty-three thousand, eight hundred fifty-eight".