78666622 has 4 divisors (see below), whose sum is σ = 117999936. Its totient is φ = 39333310.

The previous prime is 78666619. The next prime is 78666661. The reversal of 78666622 is 22666687.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19666654 + ... + 19666657.

It is an arithmetic number, because the mean of its divisors is an integer number (29499984).

Almost surely, 2^78666622 is an apocalyptic number.

78666622 is a deficient number, since it is larger than the sum of its proper divisors (39333314).

78666622 is a wasteful number, since it uses less digits than its factorization.

78666622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39333313.

The product of its digits is 290304, while the sum is 43.

The square root of 78666622 is about 8869.4206124188. The cubic root of 78666622 is about 428.4796170842.

The spelling of 78666622 in words is "seventy-eight million, six hundred sixty-six thousand, six hundred twenty-two".