78796789 has 2 divisors, whose sum is σ = 78796790. Its totient is φ = 78796788.

The previous prime is 78796787. The next prime is 78796807. The reversal of 78796789 is 98769787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72335025 + 6461764 = 8505^2 + 2542^2 .

It is an emirp because it is prime and its reverse (98769787) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78796789 - 2¹ = 78796787 is a prime.

Together with 78796787, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78796787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39398394 + 39398395.

It is an arithmetic number, because the mean of its divisors is an integer number (39398395).

Almost surely, 2^78796789 is an apocalyptic number.

It is an amenable number.

78796789 is a deficient number, since it is larger than the sum of its proper divisors (1).

78796789 is an equidigital number, since it uses as much as digits as its factorization.

78796789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10668672, while the sum is 61.

The square root of 78796789 is about 8876.7555446796. The cubic root of 78796789 is about 428.7158171004.

The spelling of 78796789 in words is "seventy-eight million, seven hundred ninety-six thousand, seven hundred eighty-nine".