28923406885 has 4 divisors (see below), whose sum is σ = 34708088268. Its totient is φ = 23138725504.

The previous prime is 28923406873. The next prime is 28923406907. The reversal of 28923406885 is 58860432982.

It is a happy number.

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 3925899649 + 24997507236 = 62657^2 + 158106^2 .

It is a cyclic number.

It is not a de Polignac number, because 28923406885 - 2¹¹ = 28923404837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 2892340684 + ... + 2892340693.

It is an arithmetic number, because the mean of its divisors is an integer number (8677022067).

Almost surely, 2^28923406885 is an apocalyptic number.

It is an amenable number.

28923406885 is a deficient number, since it is larger than the sum of its proper divisors (5784681383).

28923406885 is an equidigital number, since it uses as much as digits as its factorization.

28923406885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784681382.

The product of its (nonzero) digits is 6635520, while the sum is 55.

The spelling of 28923406885 in words is "twenty-eight billion, nine hundred twenty-three million, four hundred six thousand, eight hundred eighty-five".