28691376658 has 16 divisors (see below), whose sum is σ = 49261964544. Its totient is φ = 12277117440.

The previous prime is 28691376647. The next prime is 28691376673. The reversal of 28691376658 is 85667319682.

It is a junction number, because it is equal to n+sod(n) for n = 28691376596 and 28691376605.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1589610 + ... + 1607557.

It is an arithmetic number, because the mean of its divisors is an integer number (3078872784).

Almost surely, 2^28691376658 is an apocalyptic number.

28691376658 is a deficient number, since it is larger than the sum of its proper divisors (20570587886).

28691376658 is a wasteful number, since it uses less digits than its factorization.

28691376658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197817.

The product of its digits is 26127360, while the sum is 61.

The spelling of 28691376658 in words is "twenty-eight billion, six hundred ninety-one million, three hundred seventy-six thousand, six hundred fifty-eight".