28239509683247 has 4 divisors (see below), whose sum is σ = 28262119380000. Its totient is φ = 28216899986496.

The previous prime is 28239509683241. The next prime is 28239509683249. The reversal of 28239509683247 is 74238690593282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28239509683247 - 2²⁶ = 28239442574383 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 (28239509683241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11304846503 + ... + 11304849000.

It is an arithmetic number, because the mean of its divisors is an integer number (7065529845000).

Almost surely, 2^{28239509683247} is an apocalyptic number.

28239509683247 is a deficient number, since it is larger than the sum of its proper divisors (22609696753).

28239509683247 is a wasteful number, since it uses less digits than its factorization.

28239509683247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22609696752.

The product of its (nonzero) digits is 313528320, while the sum is 68.

The spelling of 28239509683247 in words is "twenty-eight trillion, two hundred thirty-nine billion, five hundred nine million, six hundred eighty-three thousand, two hundred forty-seven".