6816605 has 4 divisors (see below), whose sum is σ = 8179932. Its totient is φ = 5453280.

The previous prime is 6816587. The next prime is 6816613. The reversal of 6816605 is 5066186.

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 755161 + 6061444 = 869^2 + 2462^2 .

It is not a de Polignac number, because 6816605 - 2¹⁸ = 6554461 is a prime.

It is a super-2 number, since 2×6816605² = 92932207452050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 681656 + ... + 681665.

It is an arithmetic number, because the mean of its divisors is an integer number (2044983).

Almost surely, 2^6816605 is an apocalyptic number.

It is an amenable number.

6816605 is a deficient number, since it is larger than the sum of its proper divisors (1363327).

6816605 is a wasteful number, since it uses less digits than its factorization.

6816605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363326.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6816605 is about 2610.8628841822. The cubic root of 6816605 is about 189.6077317819.

The spelling of 6816605 in words is "six million, eight hundred sixteen thousand, six hundred five".