28023394779139 has 4 divisors (see below), whose sum is σ = 28047123311040. Its totient is φ = 27999666247240.

The previous prime is 28023394779137. The next prime is 28023394779143. The reversal of 28023394779139 is 93197749332082.

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 28023394779139 - 2¹ = 28023394779137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28023394779131) 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, 11864264179 + ... + 11864266540.

It is an arithmetic number, because the mean of its divisors is an integer number (7011780827760).

Almost surely, 2^{28023394779139} is an apocalyptic number.

28023394779139 is a deficient number, since it is larger than the sum of its proper divisors (23728531901).

28023394779139 is a wasteful number, since it uses less digits than its factorization.

28023394779139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23728531900.

The product of its (nonzero) digits is 123451776, while the sum is 67.

The spelling of 28023394779139 in words is "twenty-eight trillion, twenty-three billion, three hundred ninety-four million, seven hundred seventy-nine thousand, one hundred thirty-nine".