8621666 has 16 divisors (see below), whose sum is σ = 13362624. Its totient is φ = 4168944.

The previous prime is 8621653. The next prime is 8621677. The reversal of 8621666 is 6661268.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19241 + ... + 19683.

It is an arithmetic number, because the mean of its divisors is an integer number (835164).

Almost surely, 2^8621666 is an apocalyptic number.

8621666 is a deficient number, since it is larger than the sum of its proper divisors (4740958).

8621666 is a wasteful number, since it uses less digits than its factorization.

8621666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 745.

The product of its digits is 20736, while the sum is 35.

The square root of 8621666 is about 2936.2673583991. The cubic root of 8621666 is about 205.0518686916.

The spelling of 8621666 in words is "eight million, six hundred twenty-one thousand, six hundred sixty-six".