28788913192877 has 4 divisors (see below), whose sum is σ = 28955323095900. Its totient is φ = 28622503289856.

The previous prime is 28788913192771. The next prime is 28788913192903. The reversal of 28788913192877 is 77829131988782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19294047465001 + 9494865727876 = 4392499^2 + 3081374^2 .

It is a cyclic number.

It is not a de Polignac number, because 28788913192877 - 2⁸ = 28788913192621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788913195877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83204951252 + ... + 83204951597.

It is an arithmetic number, because the mean of its divisors is an integer number (7238830773975).

Almost surely, 2^{28788913192877} is an apocalyptic number.

It is an amenable number.

28788913192877 is a deficient number, since it is larger than the sum of its proper divisors (166409903023).

28788913192877 is a wasteful number, since it uses less digits than its factorization.

28788913192877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166409903022.

The product of its digits is 1365590016, while the sum is 80.

The spelling of 28788913192877 in words is "twenty-eight trillion, seven hundred eighty-eight billion, nine hundred thirteen million, one hundred ninety-two thousand, eight hundred seventy-seven".