78897601 has 2 divisors, whose sum is σ = 78897602. Its totient is φ = 78897600.

The previous prime is 78897593. The next prime is 78897619. The reversal of 78897601 is 10679887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77457601 + 1440000 = 8801^2 + 1200^2 .

It is an emirp because it is prime and its reverse (10679887) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78897601 - 2³ = 78897593 is a prime.

It is not a weakly prime, because it can be changed into another prime (78897701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39448800 + 39448801.

It is an arithmetic number, because the mean of its divisors is an integer number (39448801).

Almost surely, 2^78897601 is an apocalyptic number.

It is an amenable number.

78897601 is a deficient number, since it is larger than the sum of its proper divisors (1).

78897601 is an equidigital number, since it uses as much as digits as its factorization.

78897601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 46.

The square root of 78897601 is about 8882.4321556655. The cubic root of 78897601 is about 428.8985710804.

It can be divided in two parts, 788 and 97601, that added together give a palindrome (98389).

The spelling of 78897601 in words is "seventy-eight million, eight hundred ninety-seven thousand, six hundred one".