78597793 has 2 divisors, whose sum is σ = 78597794. Its totient is φ = 78597792.

The previous prime is 78597791. The next prime is 78597797. The reversal of 78597793 is 39779587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63489024 + 15108769 = 7968^2 + 3887^2 .

It is an emirp because it is prime and its reverse (39779587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78597793 - 2¹ = 78597791 is a prime.

It is a super-2 number, since 2×78597793² = 12355226128941698, which contains 22 as substring.

Together with 78597791, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78597791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39298896 + 39298897.

It is an arithmetic number, because the mean of its divisors is an integer number (39298897).

Almost surely, 2^78597793 is an apocalyptic number.

It is an amenable number.

78597793 is a deficient number, since it is larger than the sum of its proper divisors (1).

78597793 is an equidigital number, since it uses as much as digits as its factorization.

78597793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3333960, while the sum is 55.

The square root of 78597793 is about 8865.5396338858. The cubic root of 78597793 is about 428.3546151955.

It can be divided in two parts, 78 and 597793, that added together give a triangular number (597871 = T₁₀₉₃).

The spelling of 78597793 in words is "seventy-eight million, five hundred ninety-seven thousand, seven hundred ninety-three".