78949447 has 2 divisors, whose sum is σ = 78949448. Its totient is φ = 78949446.

The previous prime is 78949441. The next prime is 78949459. The reversal of 78949447 is 74494987.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78949447 - 2¹⁵ = 78916679 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78949394 and 78949403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78949441) 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, 39474723 + 39474724.

It is an arithmetic number, because the mean of its divisors is an integer number (39474724).

Almost surely, 2^78949447 is an apocalyptic number.

78949447 is a deficient number, since it is larger than the sum of its proper divisors (1).

78949447 is an equidigital number, since it uses as much as digits as its factorization.

78949447 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2032128, while the sum is 52.

The square root of 78949447 is about 8885.3501337876. The cubic root of 78949447 is about 428.9924979173.

The spelling of 78949447 in words is "seventy-eight million, nine hundred forty-nine thousand, four hundred forty-seven".