78098929 has 2 divisors, whose sum is σ = 78098930. Its totient is φ = 78098928.

The previous prime is 78098927. The next prime is 78098981. The reversal of 78098929 is 92989087.

It is an a-pointer prime, because the next prime (78098981) can be obtained adding 78098929 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77000625 + 1098304 = 8775^2 + 1048^2 .

It is a cyclic number.

It is not a de Polignac number, because 78098929 - 2¹ = 78098927 is a prime.

Together with 78098927, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (78098921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39049464 + 39049465.

It is an arithmetic number, because the mean of its divisors is an integer number (39049465).

Almost surely, 2^78098929 is an apocalyptic number.

It is an amenable number.

78098929 is a deficient number, since it is larger than the sum of its proper divisors (1).

78098929 is an equidigital number, since it uses as much as digits as its factorization.

78098929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 52.

The square root of 78098929 is about 8837.3598433016. The cubic root of 78098929 is about 427.4464285435.

The spelling of 78098929 in words is "seventy-eight million, ninety-eight thousand, nine hundred twenty-nine".