28117643537 has 2 divisors, whose sum is σ = 28117643538. Its totient is φ = 28117643536.

The previous prime is 28117643501. The next prime is 28117643621. The reversal of 28117643537 is 73534671182.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27159369601 + 958273936 = 164801^2 + 30956^2 .

It is a cyclic number.

It is not a de Polignac number, because 28117643537 - 2⁶ = 28117643473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28117643491 and 28117643500.

It is not a weakly prime, because it can be changed into another prime (28117643737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058821768 + 14058821769.

It is an arithmetic number, because the mean of its divisors is an integer number (14058821769).

Almost surely, 2^28117643537 is an apocalyptic number.

It is an amenable number.

28117643537 is a deficient number, since it is larger than the sum of its proper divisors (1).

28117643537 is an equidigital number, since it uses as much as digits as its factorization.

28117643537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 47.

The spelling of 28117643537 in words is "twenty-eight billion, one hundred seventeen million, six hundred forty-three thousand, five hundred thirty-seven".