28615771863 has 24 divisors (see below), whose sum is σ = 47446858368. Its totient is φ = 16279826832.

The previous prime is 28615771861. The next prime is 28615771867. The reversal of 28615771863 is 36817751682.

It is a happy number.

28615771863 is a `hidden beast` number, since 2 + 8 + 6 + 1 + 577 + 1 + 8 + 63 = 666.

It is not a de Polignac number, because 28615771863 - 2¹ = 28615771861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28615771861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 986181 + ... + 1014782.

It is an arithmetic number, because the mean of its divisors is an integer number (1976952432).

Almost surely, 2^28615771863 is an apocalyptic number.

28615771863 is a deficient number, since it is larger than the sum of its proper divisors (18831086505).

28615771863 is a wasteful number, since it uses less digits than its factorization.

28615771863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2001203 (or 2001200 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 28615771863 in words is "twenty-eight billion, six hundred fifteen million, seven hundred seventy-one thousand, eight hundred sixty-three".