28810909850 has 24 divisors (see below), whose sum is σ = 55436167260. Its totient is φ = 11126971520.

The previous prime is 28810909811. The next prime is 28810909909. The reversal of 28810909850 is 5890901882.

It can be written as a sum of positive squares in 6 ways, for example, as 7594948201 + 21215961649 = 87149^2 + 145657^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9933347 + ... + 9936246.

Almost surely, 2^28810909850 is an apocalyptic number.

28810909850 is a deficient number, since it is larger than the sum of its proper divisors (26625257410).

28810909850 is a wasteful number, since it uses less digits than its factorization.

28810909850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19869634 (or 19869629 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 50.

The spelling of 28810909850 in words is "twenty-eight billion, eight hundred ten million, nine hundred nine thousand, eight hundred fifty".