78623816 has 16 divisors (see below), whose sum is σ = 151404540. Its totient is φ = 38249280.

The previous prime is 78623807. The next prime is 78623819. The reversal of 78623816 is 61832687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 78251716 + 372100 = 8846^2 + 610^2 .

It is not an unprimeable number, because it can be changed into a prime (78623819) 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 3 ways as a sum of consecutive naturals, for example, 132515 + ... + 133106.

Almost surely, 2^78623816 is an apocalyptic number.

It is an amenable number.

78623816 is a deficient number, since it is larger than the sum of its proper divisors (72780724).

78623816 is a wasteful number, since it uses less digits than its factorization.

78623816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265664 (or 265660 counting only the distinct ones).

The product of its digits is 96768, while the sum is 41.

The square root of 78623816 is about 8867.0071613820. The cubic root of 78623816 is about 428.4018847253.

The spelling of 78623816 in words is "seventy-eight million, six hundred twenty-three thousand, eight hundred sixteen".