7666738 has 4 divisors (see below), whose sum is σ = 11500110. Its totient is φ = 3833368.

The previous prime is 7666717. The next prime is 7666741. The reversal of 7666738 is 8376667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8376667 = 13 ⋅644359.

It can be written as a sum of positive squares in only one way, i.e., 6692569 + 974169 = 2587^2 + 987^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7666694 and 7666703.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1916683 + ... + 1916686.

Almost surely, 2^7666738 is an apocalyptic number.

7666738 is a deficient number, since it is larger than the sum of its proper divisors (3833372).

7666738 is a wasteful number, since it uses less digits than its factorization.

7666738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3833371.

The product of its digits is 254016, while the sum is 43.

The square root of 7666738 is about 2768.8875022290. The cubic root of 7666738 is about 197.1833348737.

The spelling of 7666738 in words is "seven million, six hundred sixty-six thousand, seven hundred thirty-eight".