28651836808 has 32 divisors (see below), whose sum is σ = 62894280960. Its totient is φ = 11979861120.

The previous prime is 28651836797. The next prime is 28651836877. The reversal of 28651836808 is 80863815682.

It is a happy number.

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, 6237216 + ... + 6241807.

It is an arithmetic number, because the mean of its divisors is an integer number (1965446280).

Almost surely, 2^28651836808 is an apocalyptic number.

28651836808 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28651836808 is an abundant number, since it is smaller than the sum of its proper divisors (34242444152).

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

28651836808 is a wasteful number, since it uses less digits than its factorization.

28651836808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12479077 (or 12479073 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 55.

The spelling of 28651836808 in words is "twenty-eight billion, six hundred fifty-one million, eight hundred thirty-six thousand, eight hundred eight".