8666642 has 16 divisors (see below), whose sum is σ = 13267800. Its totient is φ = 4245120.

The previous prime is 8666627. The next prime is 8666681. The reversal of 8666642 is 2466668.

It can be written as a sum of positive squares in 4 ways, for example, as 1371241 + 7295401 = 1171^2 + 2701^2 .

It is a super-2 number, since 2×8666642² = 150221367112328, which contains 22 as substring.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 8666596 and 8666605.

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, 32084 + ... + 32352.

Almost surely, 2^8666642 is an apocalyptic number.

8666642 is a deficient number, since it is larger than the sum of its proper divisors (4601158).

8666642 is a wasteful number, since it uses less digits than its factorization.

8666642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 541.

The product of its digits is 82944, while the sum is 38.

The square root of 8666642 is about 2943.9160993479. The cubic root of 8666642 is about 205.4078100505.

The spelling of 8666642 in words is "eight million, six hundred sixty-six thousand, six hundred forty-two".