28081672785 has 64 divisors (see below), whose sum is σ = 55157967360. Its totient is φ = 13483008000.

The previous prime is 28081672769. The next prime is 28081672789. The reversal of 28081672785 is 58727618082.

It is not a de Polignac number, because 28081672785 - 2⁴ = 28081672769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28081672789) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 213216 + ... + 318785.

It is an arithmetic number, because the mean of its divisors is an integer number (861843240).

Almost surely, 2^28081672785 is an apocalyptic number.

It is an amenable number.

28081672785 is a deficient number, since it is larger than the sum of its proper divisors (27076294575).

28081672785 is a wasteful number, since it uses less digits than its factorization.

28081672785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532055 (or 532049 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 54.

The spelling of 28081672785 in words is "twenty-eight billion, eighty-one million, six hundred seventy-two thousand, seven hundred eighty-five".