28102939217 has 8 divisors (see below), whose sum is σ = 28232965800. Its totient is φ = 27973102464.

The previous prime is 28102939147. The next prime is 28102939253. The reversal of 28102939217 is 71293920182.

It can be written as a sum of positive squares in 4 ways, for example, as 883218961 + 27219720256 = 29719^2 + 164984^2 .

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 28102939217 - 2¹⁶ = 28102873681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28102939297) 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, 253709 + ... + 347237.

It is an arithmetic number, because the mean of its divisors is an integer number (3529120725).

Almost surely, 2^28102939217 is an apocalyptic number.

It is an amenable number.

28102939217 is a deficient number, since it is larger than the sum of its proper divisors (130026583).

28102939217 is a wasteful number, since it uses less digits than its factorization.

28102939217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94915.

The product of its (nonzero) digits is 108864, while the sum is 44.

The spelling of 28102939217 in words is "twenty-eight billion, one hundred two million, nine hundred thirty-nine thousand, two hundred seventeen".