28321117442 has 8 divisors (see below), whose sum is σ = 43517814732. Its totient is φ = 13815179200.

The previous prime is 28321117439. The next prime is 28321117463. The reversal of 28321117442 is 24471112382.

It can be written as a sum of positive squares in 2 ways, for example, as 23985026641 + 4336090801 = 154871^2 + 65849^2 .

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

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, 172689659 + ... + 172689822.

Almost surely, 2^28321117442 is an apocalyptic number.

28321117442 is a deficient number, since it is larger than the sum of its proper divisors (15196697290).

28321117442 is a wasteful number, since it uses less digits than its factorization.

28321117442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345379524.

The product of its digits is 21504, while the sum is 35.

The spelling of 28321117442 in words is "twenty-eight billion, three hundred twenty-one million, one hundred seventeen thousand, four hundred forty-two".