28121067447 has 32 divisors (see below), whose sum is σ = 41282334720. Its totient is φ = 16885596000.

The previous prime is 28121067419. The next prime is 28121067467. The reversal of 28121067447 is 74476012182.

It is not a de Polignac number, because 28121067447 - 2¹² = 28121063351 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28121067399 and 28121067408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28121067467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2843922 + ... + 2853792.

It is an arithmetic number, because the mean of its divisors is an integer number (1290072960).

Almost surely, 2^28121067447 is an apocalyptic number.

28121067447 is a deficient number, since it is larger than the sum of its proper divisors (13161267273).

28121067447 is a wasteful number, since it uses less digits than its factorization.

28121067447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10675.

The product of its (nonzero) digits is 150528, while the sum is 42.

The spelling of 28121067447 in words is "twenty-eight billion, one hundred twenty-one million, sixty-seven thousand, four hundred forty-seven".