78565412 has 6 divisors (see below), whose sum is σ = 137489478. Its totient is φ = 39282704.

The previous prime is 78565391. The next prime is 78565453. The reversal of 78565412 is 21456587.

It can be written as a sum of positive squares in only one way, i.e., 49900096 + 28665316 = 7064^2 + 5354^2 .

It is an alternating number because its digits alternate between odd and even.

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 as a sum of consecutive naturals, namely, 9820673 + ... + 9820680.

It is an arithmetic number, because the mean of its divisors is an integer number (22914913).

Almost surely, 2^78565412 is an apocalyptic number.

It is an amenable number.

78565412 is a deficient number, since it is larger than the sum of its proper divisors (58924066).

78565412 is a wasteful number, since it uses less digits than its factorization.

78565412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19641357 (or 19641355 counting only the distinct ones).

The product of its digits is 67200, while the sum is 38.

The square root of 78565412 is about 8863.7132173824. The cubic root of 78565412 is about 428.2957820930.

The spelling of 78565412 in words is "seventy-eight million, five hundred sixty-five thousand, four hundred twelve".