78643276 has 12 divisors (see below), whose sum is σ = 137700808. Its totient is φ = 39300192.

The previous prime is 78643237. The next prime is 78643297. The reversal of 78643276 is 67234687.

It is a happy number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5200 + ... + 13576.

Almost surely, 2^78643276 is an apocalyptic number.

It is an amenable number.

78643276 is a deficient number, since it is larger than the sum of its proper divisors (59057532).

78643276 is a wasteful number, since it uses less digits than its factorization.

78643276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10728 (or 10726 counting only the distinct ones).

The product of its digits is 338688, while the sum is 43.

The square root of 78643276 is about 8868.1044197731. The cubic root of 78643276 is about 428.4372260650.

The spelling of 78643276 in words is "seventy-eight million, six hundred forty-three thousand, two hundred seventy-six".