78955829 has 2 divisors, whose sum is σ = 78955830. Its totient is φ = 78955828.

The previous prime is 78955823. The next prime is 78955831. The reversal of 78955829 is 92855987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 70946929 + 8008900 = 8423^2 + 2830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78955829 is a prime.

Together with 78955831, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78955823) 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, 39477914 + 39477915.

It is an arithmetic number, because the mean of its divisors is an integer number (39477915).

Almost surely, 2^78955829 is an apocalyptic number.

It is an amenable number.

78955829 is a deficient number, since it is larger than the sum of its proper divisors (1).

78955829 is an equidigital number, since it uses as much as digits as its factorization.

78955829 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1814400, while the sum is 53.

The square root of 78955829 is about 8885.7092570036. The cubic root of 78955829 is about 429.0040570286.

The spelling of 78955829 in words is "seventy-eight million, nine hundred fifty-five thousand, eight hundred twenty-nine".