7661686 has 4 divisors (see below), whose sum is σ = 11492532. Its totient is φ = 3830842.

The previous prime is 7661677. The next prime is 7661707. The reversal of 7661686 is 6861667.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6861667 = 1951 ⋅3517.

It is a congruent number.

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, 1915420 + ... + 1915423.

It is an arithmetic number, because the mean of its divisors is an integer number (2873133).

Almost surely, 2^7661686 is an apocalyptic number.

7661686 is a deficient number, since it is larger than the sum of its proper divisors (3830846).

7661686 is a wasteful number, since it uses less digits than its factorization.

7661686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830845.

The product of its digits is 72576, while the sum is 40.

The square root of 7661686 is about 2767.9750721421. The cubic root of 7661686 is about 197.1400140117.

The spelling of 7661686 in words is "seven million, six hundred sixty-one thousand, six hundred eighty-six".