28520367817979 has 2 divisors, whose sum is σ = 28520367817980. Its totient is φ = 28520367817978.

The previous prime is 28520367817973. The next prime is 28520367818057. The reversal of 28520367817979 is 97971876302582.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28520367817979 is a prime.

It is a super-2 number, since 2×28520367817979² (a number of 28 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28520367817973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14260183908989 + 14260183908990.

It is an arithmetic number, because the mean of its divisors is an integer number (14260183908990).

Almost surely, 2^{28520367817979} is an apocalyptic number.

28520367817979 is a deficient number, since it is larger than the sum of its proper divisors (1).

28520367817979 is an equidigital number, since it uses as much as digits as its factorization.

28520367817979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640120320, while the sum is 74.

The spelling of 28520367817979 in words is "twenty-eight trillion, five hundred twenty billion, three hundred sixty-seven million, eight hundred seventeen thousand, nine hundred seventy-nine".