28364240281 has 8 divisors (see below), whose sum is σ = 30889320840. Its totient is φ = 25888190592.

The previous prime is 28364240273. The next prime is 28364240287. The reversal of 28364240281 is 18204246382.

It can be written as a sum of positive squares in 4 ways, for example, as 570015625 + 27794224656 = 23875^2 + 166716^2 .

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 28364240281 - 2³ = 28364240273 is a prime.

It is a super-2 number, since 2×28364240281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28364240287) 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, 12256510 + ... + 12258823.

It is an arithmetic number, because the mean of its divisors is an integer number (3861165105).

Almost surely, 2^28364240281 is an apocalyptic number.

It is an amenable number.

28364240281 is a deficient number, since it is larger than the sum of its proper divisors (2525080559).

28364240281 is a wasteful number, since it uses less digits than its factorization.

28364240281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24515435.

The product of its (nonzero) digits is 147456, while the sum is 40.

The spelling of 28364240281 in words is "twenty-eight billion, three hundred sixty-four million, two hundred forty thousand, two hundred eighty-one".