28878525611 has 4 divisors (see below), whose sum is σ = 31099950672. Its totient is φ = 26657100552.

The previous prime is 28878525607. The next prime is 28878525649. The reversal of 28878525611 is 11652587882.

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

It is a cyclic number.

It is not a de Polignac number, because 28878525611 - 2² = 28878525607 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28878525911) 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 3 ways as a sum of consecutive naturals, for example, 1110712511 + ... + 1110712536.

It is an arithmetic number, because the mean of its divisors is an integer number (7774987668).

Almost surely, 2^28878525611 is an apocalyptic number.

28878525611 is a deficient number, since it is larger than the sum of its proper divisors (2221425061).

28878525611 is a wasteful number, since it uses less digits than its factorization.

28878525611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2221425060.

The product of its digits is 2150400, while the sum is 53.

The spelling of 28878525611 in words is "twenty-eight billion, eight hundred seventy-eight million, five hundred twenty-five thousand, six hundred eleven".