28715715747 has 24 divisors (see below), whose sum is σ = 42028683840. Its totient is φ = 18891403440.

The previous prime is 28715715739. The next prime is 28715715761. The reversal of 28715715747 is 74751751782.

28715715747 is a `hidden beast` number, since 28 + 7 + 1 + 571 + 5 + 7 + 47 = 666.

It is not a de Polignac number, because 28715715747 - 2³ = 28715715739 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28715715693 and 28715715702.

It is not an unprimeable number, because it can be changed into a prime (28715715247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 143008 + ... + 279074.

It is an arithmetic number, because the mean of its divisors is an integer number (1751195160).

Almost surely, 2^28715715747 is an apocalyptic number.

28715715747 is a deficient number, since it is larger than the sum of its proper divisors (13312968093).

28715715747 is a wasteful number, since it uses less digits than its factorization.

28715715747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136383 (or 136380 counting only the distinct ones).

The product of its digits is 3841600, while the sum is 54.

The spelling of 28715715747 in words is "twenty-eight billion, seven hundred fifteen million, seven hundred fifteen thousand, seven hundred forty-seven".