79878229 has 2 divisors, whose sum is σ = 79878230. Its totient is φ = 79878228.

The previous prime is 79878217. The next prime is 79878247. The reversal of 79878229 is 92287897.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75655204 + 4223025 = 8698^2 + 2055^2 .

It is a cyclic number.

It is not a de Polignac number, because 79878229 - 2⁷ = 79878101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79878259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39939114 + 39939115.

It is an arithmetic number, because the mean of its divisors is an integer number (39939115).

Almost surely, 2^79878229 is an apocalyptic number.

It is an amenable number.

79878229 is a deficient number, since it is larger than the sum of its proper divisors (1).

79878229 is an equidigital number, since it uses as much as digits as its factorization.

79878229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 52.

The square root of 79878229 is about 8937.4621118078. The cubic root of 79878229 is about 430.6682039322.

The spelling of 79878229 in words is "seventy-nine million, eight hundred seventy-eight thousand, two hundred twenty-nine".