78629953 has 2 divisors, whose sum is σ = 78629954. Its totient is φ = 78629952.

The previous prime is 78629951. The next prime is 78629983. The reversal of 78629953 is 35992687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70694464 + 7935489 = 8408^2 + 2817^2 .

It is an emirp because it is prime and its reverse (35992687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78629953 - 2¹ = 78629951 is a prime.

Together with 78629951, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 78629897 and 78629906.

It is not a weakly prime, because it can be changed into another prime (78629951) 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, 39314976 + 39314977.

It is an arithmetic number, because the mean of its divisors is an integer number (39314977).

Almost surely, 2^78629953 is an apocalyptic number.

It is an amenable number.

78629953 is a deficient number, since it is larger than the sum of its proper divisors (1).

78629953 is an equidigital number, since it uses as much as digits as its factorization.

78629953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 49.

The square root of 78629953 is about 8867.3532127687. The cubic root of 78629953 is about 428.4130307711.

The spelling of 78629953 in words is "seventy-eight million, six hundred twenty-nine thousand, nine hundred fifty-three".