28941691663805 has 8 divisors (see below), whose sum is σ = 34737383408352. Its totient is φ = 23148451056528.

The previous prime is 28941691663721. The next prime is 28941691663813. The reversal of 28941691663805 is 50836619614982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28941691663805 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent 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, 612758339 + ... + 612805568.

It is an arithmetic number, because the mean of its divisors is an integer number (4342172926044).

Almost surely, 2^{28941691663805} is an apocalyptic number.

It is an amenable number.

28941691663805 is a deficient number, since it is larger than the sum of its proper divisors (5795691744547).

28941691663805 is a wasteful number, since it uses less digits than its factorization.

28941691663805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225568635.

The product of its (nonzero) digits is 134369280, while the sum is 68.

The spelling of 28941691663805 in words is "twenty-eight trillion, nine hundred forty-one billion, six hundred ninety-one million, six hundred sixty-three thousand, eight hundred five".