28770139877 has 4 divisors (see below), whose sum is σ = 28980141036. Its totient is φ = 28560138720.

The previous prime is 28770139859. The next prime is 28770139897. The reversal of 28770139877 is 77893107782.

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 21236941441 + 7533198436 = 145729^2 + 86794^2 .

It is a cyclic number.

It is not a de Polignac number, because 28770139877 - 2⁶ = 28770139813 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 (28770139847) 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, 105000374 + ... + 105000647.

It is an arithmetic number, because the mean of its divisors is an integer number (7245035259).

Almost surely, 2^28770139877 is an apocalyptic number.

It is an amenable number.

28770139877 is a deficient number, since it is larger than the sum of its proper divisors (210001159).

28770139877 is a wasteful number, since it uses less digits than its factorization.

28770139877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210001158.

The product of its (nonzero) digits is 8297856, while the sum is 59.

The spelling of 28770139877 in words is "twenty-eight billion, seven hundred seventy million, one hundred thirty-nine thousand, eight hundred seventy-seven".