7885661 has 4 divisors (see below), whose sum is σ = 9012192. Its totient is φ = 6759132.

The previous prime is 7885649. The next prime is 7885681. The reversal of 7885661 is 1665887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1665887 = 251 ⋅6637.

It is a cyclic number.

It is not a de Polignac number, because 7885661 - 2²² = 3691357 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7885621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 563255 + ... + 563268.

It is an arithmetic number, because the mean of its divisors is an integer number (2253048).

Almost surely, 2^7885661 is an apocalyptic number.

It is an amenable number.

7885661 is a deficient number, since it is larger than the sum of its proper divisors (1126531).

7885661 is a wasteful number, since it uses less digits than its factorization.

7885661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1126530.

The product of its digits is 80640, while the sum is 41.

The square root of 7885661 is about 2808.1419123684. The cubic root of 7885661 is about 199.0425992319.

The spelling of 7885661 in words is "seven million, eight hundred eighty-five thousand, six hundred sixty-one".