78445212 has 24 divisors (see below), whose sum is σ = 184818816. Its totient is φ = 25894128.

The previous prime is 78445189. The next prime is 78445253. The reversal of 78445212 is 21254487.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30498 + ... + 32969.

It is an arithmetic number, because the mean of its divisors is an integer number (7700784).

Almost surely, 2^78445212 is an apocalyptic number.

It is an amenable number.

78445212 is an abundant number, since it is smaller than the sum of its proper divisors (106373604).

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

78445212 is a wasteful number, since it uses less digits than its factorization.

78445212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63577 (or 63575 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 78445212 is about 8856.9301679532. The cubic root of 78445212 is about 428.0772489908.

Adding to 78445212 its reverse (21254487), we get a palindrome (99699699).

The spelling of 78445212 in words is "seventy-eight million, four hundred forty-five thousand, two hundred twelve".