78684426 has 32 divisors (see below), whose sum is σ = 182459520. Its totient is φ = 25087392.

The previous prime is 78684421. The next prime is 78684451. The reversal of 78684426 is 62448687.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78684421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30435 + ... + 32918.

It is an arithmetic number, because the mean of its divisors is an integer number (5701860).

Almost surely, 2^78684426 is an apocalyptic number.

78684426 is an abundant number, since it is smaller than the sum of its proper divisors (103775094).

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

78684426 is a wasteful number, since it uses less digits than its factorization.

78684426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63387 (or 63381 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 78684426 is about 8870.4242288630. The cubic root of 78684426 is about 428.5119394571.

The spelling of 78684426 in words is "seventy-eight million, six hundred eighty-four thousand, four hundred twenty-six".