78490829 has 2 divisors, whose sum is σ = 78490830. Its totient is φ = 78490828.

The previous prime is 78490823. The next prime is 78490861. The reversal of 78490829 is 92809487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60808804 + 17682025 = 7798^2 + 4205^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78490829 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78490823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39245414 + 39245415.

It is an arithmetic number, because the mean of its divisors is an integer number (39245415).

Almost surely, 2^78490829 is an apocalyptic number.

It is an amenable number.

78490829 is a deficient number, since it is larger than the sum of its proper divisors (1).

78490829 is an equidigital number, since it uses as much as digits as its factorization.

78490829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 78490829 is about 8859.5050087463. The cubic root of 78490829 is about 428.1602105695.

The spelling of 78490829 in words is "seventy-eight million, four hundred ninety thousand, eight hundred twenty-nine".