8120669 has 4 divisors (see below), whose sum is σ = 8140380. Its totient is φ = 8100960.

The previous prime is 8120659. The next prime is 8120677. The reversal of 8120669 is 9660218.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2059225 + 6061444 = 1435^2 + 2462^2 .

It is a cyclic number.

It is not a de Polignac number, because 8120669 - 2⁴ = 8120653 is a prime.

It is a super-2 number, since 2×8120669² = 131890530015122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8120659) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9224 + ... + 10065.

It is an arithmetic number, because the mean of its divisors is an integer number (2035095).

Almost surely, 2^8120669 is an apocalyptic number.

It is an amenable number.

8120669 is a deficient number, since it is larger than the sum of its proper divisors (19711).

8120669 is a wasteful number, since it uses less digits than its factorization.

8120669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19710.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 8120669 is about 2849.6787538247. The cubic root of 8120669 is about 201.0005610407. Note that the first 3 decimals are identical.

The spelling of 8120669 in words is "eight million, one hundred twenty thousand, six hundred sixty-nine".