78666436 has 12 divisors (see below), whose sum is σ = 140868112. Its totient is φ = 38418408.

The previous prime is 78666433. The next prime is 78666451. The reversal of 78666436 is 63466687.

It is not an unprimeable number, because it can be changed into a prime (78666431) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 228510 + ... + 228853.

Almost surely, 2^78666436 is an apocalyptic number.

It is an amenable number.

78666436 is a deficient number, since it is larger than the sum of its proper divisors (62201676).

78666436 is a wasteful number, since it uses less digits than its factorization.

78666436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 457410 (or 457408 counting only the distinct ones).

The product of its digits is 870912, while the sum is 46.

The square root of 78666436 is about 8869.4101269476. The cubic root of 78666436 is about 428.4792793838.

The spelling of 78666436 in words is "seventy-eight million, six hundred sixty-six thousand, four hundred thirty-six".