7861668 has 72 divisors (see below), whose sum is σ = 20485920. Its totient is φ = 2338560.

The previous prime is 7861657. The next prime is 7861669. The reversal of 7861668 is 8661687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7861669) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191728 + ... + 191768.

Almost surely, 2^7861668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7861668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10242960).

7861668 is an abundant number, since it is smaller than the sum of its proper divisors (12624252).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7861668 is a wasteful number, since it uses less digits than its factorization.

7861668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 94 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 7861668 is about 2803.8666159431. The cubic root of 7861668 is about 198.8405244049.

The spelling of 7861668 in words is "seven million, eight hundred sixty-one thousand, six hundred sixty-eight".