78835649 has 2 divisors, whose sum is σ = 78835650. Its totient is φ = 78835648.

The previous prime is 78835643. The next prime is 78835663. The reversal of 78835649 is 94653887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68227600 + 10608049 = 8260^2 + 3257^2 .

It is a cyclic number.

It is not a de Polignac number, because 78835649 - 2¹² = 78831553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78835597 and 78835606.

It is not a weakly prime, because it can be changed into another prime (78835643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39417824 + 39417825.

It is an arithmetic number, because the mean of its divisors is an integer number (39417825).

Almost surely, 2^78835649 is an apocalyptic number.

It is an amenable number.

78835649 is a deficient number, since it is larger than the sum of its proper divisors (1).

78835649 is an equidigital number, since it uses as much as digits as its factorization.

78835649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1451520, while the sum is 50.

The square root of 78835649 is about 8878.9441376776. The cubic root of 78835649 is about 428.7862817260.

The spelling of 78835649 in words is "seventy-eight million, eight hundred thirty-five thousand, six hundred forty-nine".