28528186643 has 32 divisors (see below), whose sum is σ = 33474304512. Its totient is φ = 24052089600.

The previous prime is 28528186639. The next prime is 28528186663. The reversal of 28528186643 is 34668182582.

It is not a de Polignac number, because 28528186643 - 2² = 28528186639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28528186613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1480853 + ... + 1499993.

It is an arithmetic number, because the mean of its divisors is an integer number (1046072016).

Almost surely, 2^28528186643 is an apocalyptic number.

28528186643 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

28528186643 is a deficient number, since it is larger than the sum of its proper divisors (4946117869).

28528186643 is a wasteful number, since it uses less digits than its factorization.

28528186643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19355.

The product of its digits is 4423680, while the sum is 53.

The spelling of 28528186643 in words is "twenty-eight billion, five hundred twenty-eight million, one hundred eighty-six thousand, six hundred forty-three".