78908329 has 2 divisors, whose sum is σ = 78908330. Its totient is φ = 78908328.

The previous prime is 78908287. The next prime is 78908369. The reversal of 78908329 is 92380987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66797929 + 12110400 = 8173^2 + 3480^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78908329 is a prime.

It is not a weakly prime, because it can be changed into another prime (78908369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39454164 + 39454165.

It is an arithmetic number, because the mean of its divisors is an integer number (39454165).

Almost surely, 2^78908329 is an apocalyptic number.

It is an amenable number.

78908329 is a deficient number, since it is larger than the sum of its proper divisors (1).

78908329 is an equidigital number, since it uses as much as digits as its factorization.

78908329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 78908329 is about 8883.0360237928. The cubic root of 78908329 is about 428.9180098435.

The spelling of 78908329 in words is "seventy-eight million, nine hundred eight thousand, three hundred twenty-nine".