28078575317 has 8 divisors (see below), whose sum is σ = 32017199256. Its totient is φ = 24394056192.

The previous prime is 28078575247. The next prime is 28078575347. The reversal of 28078575317 is 71357587082.

It can be written as a sum of positive squares in 4 ways, for example, as 11383609636 + 16694965681 = 106694^2 + 129209^2 .

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 28078575317 - 2³² = 23783608021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078575347) 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, 63525968 + ... + 63526409.

It is an arithmetic number, because the mean of its divisors is an integer number (4002149907).

Almost surely, 2^28078575317 is an apocalyptic number.

It is an amenable number.

28078575317 is a deficient number, since it is larger than the sum of its proper divisors (3938623939).

28078575317 is a wasteful number, since it uses less digits than its factorization.

28078575317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127052407.

The product of its (nonzero) digits is 3292800, while the sum is 53.

The spelling of 28078575317 in words is "twenty-eight billion, seventy-eight million, five hundred seventy-five thousand, three hundred seventeen".