78328399001 has 2 divisors, whose sum is σ = 78328399002. Its totient is φ = 78328399000.

The previous prime is 78328398937. The next prime is 78328399021. The reversal of 78328399001 is 10099382387.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51202638400 + 27125760601 = 226280^2 + 164699^2 .

It is an emirp because it is prime and its reverse (10099382387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78328399001 - 2⁶ = 78328398937 is a prime.

It is a super-2 number, since 2×78328399001² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78328399021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39164199500 + 39164199501.

It is an arithmetic number, because the mean of its divisors is an integer number (39164199501).

Almost surely, 2^78328399001 is an apocalyptic number.

It is an amenable number.

78328399001 is a deficient number, since it is larger than the sum of its proper divisors (1).

78328399001 is an equidigital number, since it uses as much as digits as its factorization.

78328399001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 78328399001 in words is "seventy-eight billion, three hundred twenty-eight million, three hundred ninety-nine thousand, one".