7863661 has 8 divisors (see below), whose sum is σ = 8515584. Its totient is φ = 7218480.

The previous prime is 7863643. The next prime is 7863671. The reversal of 7863661 is 1663687.

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 7863661 - 2⁷ = 7863533 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7863661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7863601) 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, 900 + ... + 4066.

It is an arithmetic number, because the mean of its divisors is an integer number (1064448).

Almost surely, 2^7863661 is an apocalyptic number.

It is an amenable number.

7863661 is a deficient number, since it is larger than the sum of its proper divisors (651923).

7863661 is a wasteful number, since it uses less digits than its factorization.

7863661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3371.

The product of its digits is 36288, while the sum is 37.

The square root of 7863661 is about 2804.2219954918. The cubic root of 7863661 is about 198.8573255758.

The spelling of 7863661 in words is "seven million, eight hundred sixty-three thousand, six hundred sixty-one".