827661 has 8 divisors (see below), whose sum is σ = 1108800. Its totient is φ = 549152.

The previous prime is 827639. The next prime is 827677. The reversal of 827661 is 166728.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 827661 - 2¹¹ = 825613 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 827661.

It is not an unprimeable number, because it can be changed into a prime (827681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 265 + ... + 1313.

It is an arithmetic number, because the mean of its divisors is an integer number (138600).

2⁸²⁷⁶⁶¹ is an apocalyptic number.

It is an amenable number.

827661 is a deficient number, since it is larger than the sum of its proper divisors (281139).

827661 is a wasteful number, since it uses less digits than its factorization.

827661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1315.

The product of its digits is 4032, while the sum is 30.

The square root of 827661 is about 909.7587592324. The cubic root of 827661 is about 93.8896017955.

The spelling of 827661 in words is "eight hundred twenty-seven thousand, six hundred sixty-one".