28199991007696 has 160 divisors (see below), whose sum is σ = 60109377039360. Its totient is φ = 12772453005312.

The previous prime is 28199991007679. The next prime is 28199991007723. The reversal of 28199991007696 is 69670019999182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3097874281 + ... + 3097883383.

It is an arithmetic number, because the mean of its divisors is an integer number (375683606496).

Almost surely, 2^{28199991007696} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28199991007696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30054688519680).

28199991007696 is an abundant number, since it is smaller than the sum of its proper divisors (31909386031664).

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

28199991007696 is a wasteful number, since it uses less digits than its factorization.

28199991007696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14693 (or 14687 counting only the distinct ones).

The product of its (nonzero) digits is 238085568, while the sum is 76.

The spelling of 28199991007696 in words is "twenty-eight trillion, one hundred ninety-nine billion, nine hundred ninety-one million, seven thousand, six hundred ninety-six".