28715138277 has 64 divisors (see below), whose sum is σ = 47292088320. Its totient is φ = 15125999616.

The previous prime is 28715138269. The next prime is 28715138323. The reversal of 28715138277 is 77283151782.

It is a happy number.

It is not a de Polignac number, because 28715138277 - 2³ = 28715138269 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715138227) 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, 3577773 + ... + 3585789.

It is an arithmetic number, because the mean of its divisors is an integer number (738938880).

Almost surely, 2^28715138277 is an apocalyptic number.

It is an amenable number.

28715138277 is a deficient number, since it is larger than the sum of its proper divisors (18576950043).

28715138277 is a wasteful number, since it uses less digits than its factorization.

28715138277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8250.

The product of its digits is 1317120, while the sum is 51.

The spelling of 28715138277 in words is "twenty-eight billion, seven hundred fifteen million, one hundred thirty-eight thousand, two hundred seventy-seven".