78513210 has 24 divisors (see below), whose sum is σ = 204134580. Its totient is φ = 20936832.

The previous prime is 78513203. The next prime is 78513241. The reversal of 78513210 is 1231587.

It can be written as a sum of positive squares in 2 ways, for example, as 78481881 + 31329 = 8859^2 + 177^2 .

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 436095 + ... + 436274.

Almost surely, 2^78513210 is an apocalyptic number.

78513210 is an abundant number, since it is smaller than the sum of its proper divisors (125621370).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78513210 is a wasteful number, since it uses less digits than its factorization.

78513210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872382 (or 872379 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 78513210 is about 8860.7680254028. The cubic root of 78513210 is about 428.2009021303.

Adding to 78513210 its reverse (1231587), we get a palindrome (79744797).

The spelling of 78513210 in words is "seventy-eight million, five hundred thirteen thousand, two hundred ten".