28894331811 has 8 divisors (see below), whose sum is σ = 38527335504. Its totient is φ = 19262108000.

The previous prime is 28894331797. The next prime is 28894331857. The reversal of 28894331811 is 11813349882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28894331811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28894331881) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102216 + ... + 261221.

It is an arithmetic number, because the mean of its divisors is an integer number (4815916938).

Almost surely, 2^28894331811 is an apocalyptic number.

28894331811 is a deficient number, since it is larger than the sum of its proper divisors (9633003693).

28894331811 is a wasteful number, since it uses less digits than its factorization.

28894331811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389941.

The product of its digits is 331776, while the sum is 48.

The spelling of 28894331811 in words is "twenty-eight billion, eight hundred ninety-four million, three hundred thirty-one thousand, eight hundred eleven".