28064577828 has 72 divisors (see below), whose sum is σ = 78234334528. Its totient is φ = 7669810368.

The previous prime is 28064577803. The next prime is 28064577833. The reversal of 28064577828 is 82877546082.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 271351 + ... + 360222.

Almost surely, 2^28064577828 is an apocalyptic number.

28064577828 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28064577828 is an abundant number, since it is smaller than the sum of its proper divisors (50169756700).

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

28064577828 is a wasteful number, since it uses less digits than its factorization.

28064577828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631633 (or 631608 counting only the distinct ones).

The product of its (nonzero) digits is 12042240, while the sum is 57.

The spelling of 28064577828 in words is "twenty-eight billion, sixty-four million, five hundred seventy-seven thousand, eight hundred twenty-eight".