78798213 has 48 divisors (see below), whose sum is σ = 131105520. Its totient is φ = 45176832.

The previous prime is 78798173. The next prime is 78798257. The reversal of 78798213 is 31289787.

It can be written as a sum of positive squares in 8 ways, for example, as 15069924 + 63728289 = 3882^2 + 7983^2 .

It is not a de Polignac number, because 78798213 - 2¹⁰ = 78797189 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78798113) 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 in 47 ways as a sum of consecutive naturals, for example, 343983 + ... + 344211.

It is an arithmetic number, because the mean of its divisors is an integer number (2731365).

Almost surely, 2^78798213 is an apocalyptic number.

It is an amenable number.

78798213 is a deficient number, since it is larger than the sum of its proper divisors (52307307).

78798213 is a wasteful number, since it uses less digits than its factorization.

78798213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 435 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 78798213 is about 8876.8357538033. The cubic root of 78798213 is about 428.7183996407.

The spelling of 78798213 in words is "seventy-eight million, seven hundred ninety-eight thousand, two hundred thirteen".