28347820228 has 24 divisors (see below), whose sum is σ = 61056844352. Its totient is φ = 11214522144.

The previous prime is 28347820181. The next prime is 28347820243. The reversal of 28347820228 is 82202874382.

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, 38938950 + ... + 38939677.

Almost surely, 2^28347820228 is an apocalyptic number.

28347820228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

28347820228 is an abundant number, since it is smaller than the sum of its proper divisors (32709024124).

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

28347820228 is a wasteful number, since it uses less digits than its factorization.

28347820228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77878651 (or 77878649 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 46.

The spelling of 28347820228 in words is "twenty-eight billion, three hundred forty-seven million, eight hundred twenty thousand, two hundred twenty-eight".