78892217 has 2 divisors, whose sum is σ = 78892218. Its totient is φ = 78892216.

The previous prime is 78892207. The next prime is 78892243. The reversal of 78892217 is 71229887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62980096 + 15912121 = 7936^2 + 3989^2 .

It is a cyclic number.

It is not a de Polignac number, because 78892217 - 2⁴ = 78892201 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78892207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39446108 + 39446109.

It is an arithmetic number, because the mean of its divisors is an integer number (39446109).

Almost surely, 2^78892217 is an apocalyptic number.

It is an amenable number.

78892217 is a deficient number, since it is larger than the sum of its proper divisors (1).

78892217 is an equidigital number, since it uses as much as digits as its factorization.

78892217 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 112896, while the sum is 44.

The square root of 78892217 is about 8882.1290803500. The cubic root of 78892217 is about 428.8888147954. Note that the first 4 decimals are identical.

The spelling of 78892217 in words is "seventy-eight million, eight hundred ninety-two thousand, two hundred seventeen".