78225029 has 2 divisors, whose sum is σ = 78225030. Its totient is φ = 78225028.

The previous prime is 78225019. The next prime is 78225073. The reversal of 78225029 is 92052287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61984129 + 16240900 = 7873^2 + 4030^2 .

It is an emirp because it is prime and its reverse (92052287) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78225029 - 2⁴ = 78225013 is a prime.

It is a super-2 number, since 2×78225029² = 12238310324101682, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 78225029.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78225019) 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, 39112514 + 39112515.

It is an arithmetic number, because the mean of its divisors is an integer number (39112515).

Almost surely, 2^78225029 is an apocalyptic number.

It is an amenable number.

78225029 is a deficient number, since it is larger than the sum of its proper divisors (1).

78225029 is an equidigital number, since it uses as much as digits as its factorization.

78225029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 78225029 is about 8844.4914494842. The cubic root of 78225029 is about 427.6763591860.

The spelling of 78225029 in words is "seventy-eight million, two hundred twenty-five thousand, twenty-nine".