28987258668 has 12 divisors (see below), whose sum is σ = 67636936920. Its totient is φ = 9662419552.

The previous prime is 28987258607. The next prime is 28987258673. The reversal of 28987258668 is 86685278982.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×28987258668² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1207802433 + ... + 1207802456.

It is an arithmetic number, because the mean of its divisors is an integer number (5636411410).

Almost surely, 2^28987258668 is an apocalyptic number.

It is an amenable number.

28987258668 is an abundant number, since it is smaller than the sum of its proper divisors (38649678252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28987258668 is a wasteful number, since it uses less digits than its factorization.

28987258668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2415604896 (or 2415604894 counting only the distinct ones).

The product of its digits is 185794560, while the sum is 69.

The spelling of 28987258668 in words is "twenty-eight billion, nine hundred eighty-seven million, two hundred fifty-eight thousand, six hundred sixty-eight".