78724829 has 2 divisors, whose sum is σ = 78724830. Its totient is φ = 78724828.

The previous prime is 78724817. The next prime is 78724889. The reversal of 78724829 is 92842787.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59320804 + 19404025 = 7702^2 + 4405^2 .

It is a cyclic number.

It is not a de Polignac number, because 78724829 - 2⁴ = 78724813 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78724889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39362414 + 39362415.

It is an arithmetic number, because the mean of its divisors is an integer number (39362415).

Almost surely, 2^78724829 is an apocalyptic number.

It is an amenable number.

78724829 is a deficient number, since it is larger than the sum of its proper divisors (1).

78724829 is an equidigital number, since it uses as much as digits as its factorization.

78724829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 451584, while the sum is 47.

The square root of 78724829 is about 8872.7013361208. The cubic root of 78724829 is about 428.5852712301.

The spelling of 78724829 in words is "seventy-eight million, seven hundred twenty-four thousand, eight hundred twenty-nine".