28777062505 has 4 divisors (see below), whose sum is σ = 34532475012. Its totient is φ = 23021650000.

The previous prime is 28777062499. The next prime is 28777062521. The reversal of 28777062505 is 50526077782.

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 4180786281 + 24596276224 = 64659^2 + 156832^2 .

It is not a de Polignac number, because 28777062505 - 2⁹ = 28777061993 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2877706246 + ... + 2877706255.

It is an arithmetic number, because the mean of its divisors is an integer number (8633118753).

Almost surely, 2^28777062505 is an apocalyptic number.

It is an amenable number.

28777062505 is a deficient number, since it is larger than the sum of its proper divisors (5755412507).

28777062505 is an equidigital number, since it uses as much as digits as its factorization.

28777062505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5755412506.

The product of its (nonzero) digits is 1646400, while the sum is 49.

The spelling of 28777062505 in words is "twenty-eight billion, seven hundred seventy-seven million, sixty-two thousand, five hundred five".