28133350721 has 8 divisors (see below), whose sum is σ = 32177471424. Its totient is φ = 24095497680.

The previous prime is 28133350669. The next prime is 28133350759. The reversal of 28133350721 is 12705333182.

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

It is a cyclic number.

It is not a de Polignac number, because 28133350721 - 2¹⁰ = 28133349697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28133350771) 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, 1557290 + ... + 1575251.

It is an arithmetic number, because the mean of its divisors is an integer number (4022183928).

Almost surely, 2^28133350721 is an apocalyptic number.

It is an amenable number.

28133350721 is a deficient number, since it is larger than the sum of its proper divisors (4044120703).

28133350721 is a wasteful number, since it uses less digits than its factorization.

28133350721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3133831.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 28133350721 in words is "twenty-eight billion, one hundred thirty-three million, three hundred fifty thousand, seven hundred twenty-one".