28920632485 has 4 divisors (see below), whose sum is σ = 34704758988. Its totient is φ = 23136505984.

The previous prime is 28920632473. The next prime is 28920632501. The reversal of 28920632485 is 58423602982.

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 7328387236 + 21592245249 = 85606^2 + 146943^2 .

It is a cyclic number.

It is not a de Polignac number, because 28920632485 - 2¹¹ = 28920630437 is a prime.

It is a Duffinian number.

It is a congruent 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, 2892063244 + ... + 2892063253.

It is an arithmetic number, because the mean of its divisors is an integer number (8676189747).

Almost surely, 2^28920632485 is an apocalyptic number.

It is an amenable number.

28920632485 is a deficient number, since it is larger than the sum of its proper divisors (5784126503).

28920632485 is an equidigital number, since it uses as much as digits as its factorization.

28920632485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5784126502.

The product of its (nonzero) digits is 1658880, while the sum is 49.

The spelling of 28920632485 in words is "twenty-eight billion, nine hundred twenty million, six hundred thirty-two thousand, four hundred eighty-five".