77627666 has 4 divisors (see below), whose sum is σ = 116441502. Its totient is φ = 38813832.

The previous prime is 77627663. The next prime is 77627677. The reversal of 77627666 is 66672677.

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

It can be written as a sum of positive squares in only one way, i.e., 76930441 + 697225 = 8771^2 + 835^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 77627666.

It is not an unprimeable number, because it can be changed into a prime (77627663) by changing a digit.

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 as a sum of consecutive naturals, namely, 19406915 + ... + 19406918.

Almost surely, 2^77627666 is an apocalyptic number.

77627666 is a deficient number, since it is larger than the sum of its proper divisors (38813836).

77627666 is a wasteful number, since it uses less digits than its factorization.

77627666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38813835.

The product of its digits is 889056, while the sum is 47.

The square root of 77627666 is about 8810.6563887147. The cubic root of 77627666 is about 426.5849304963.

The spelling of 77627666 in words is "seventy-seven million, six hundred twenty-seven thousand, six hundred sixty-six".