28099603796856 has 64 divisors (see below), whose sum is σ = 76496199120000. Its totient is φ = 8567574293376.

The previous prime is 28099603796843. The next prime is 28099603796863. The reversal of 28099603796856 is 65869730699082.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1062433986 + ... + 1062460433.

It is an arithmetic number, because the mean of its divisors is an integer number (1195253111250).

Almost surely, 2^{28099603796856} is an apocalyptic number.

It is an amenable number.

28099603796856 is an abundant number, since it is smaller than the sum of its proper divisors (48396595323144).

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

28099603796856 is a wasteful number, since it uses less digits than its factorization.

28099603796856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124894476 (or 2124894472 counting only the distinct ones).

The product of its (nonzero) digits is 2116316160, while the sum is 78.

The spelling of 28099603796856 in words is "twenty-eight trillion, ninety-nine billion, six hundred three million, seven hundred ninety-six thousand, eight hundred fifty-six".