328772778787 has 2 divisors, whose sum is σ = 328772778788. Its totient is φ = 328772778786.

The previous prime is 328772778773. The next prime is 328772778793. The reversal of 328772778787 is 787877277823.

It is a strong prime.

It is an emirp because it is prime and its reverse (787877277823) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 328772778787 - 2²⁷ = 328638561059 is a prime.

It is not a weakly prime, because it can be changed into another prime (328772778287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164386389393 + 164386389394.

It is an arithmetic number, because the mean of its divisors is an integer number (164386389394).

Almost surely, 2^328772778787 is an apocalyptic number.

328772778787 is a deficient number, since it is larger than the sum of its proper divisors (1).

328772778787 is an equidigital number, since it uses as much as digits as its factorization.

328772778787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 722835456, while the sum is 73.

The spelling of 328772778787 in words is "three hundred twenty-eight billion, seven hundred seventy-two million, seven hundred seventy-eight thousand, seven hundred eighty-seven".