7581668 has 12 divisors (see below), whose sum is σ = 13315260. Its totient is φ = 3777312.

The previous prime is 7581667. The next prime is 7581671. The reversal of 7581668 is 8661857.

It can be written as a sum of positive squares in 2 ways, for example, as 3771364 + 3810304 = 1942^2 + 1952^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (7581667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063 + ... + 4406.

It is an arithmetic number, because the mean of its divisors is an integer number (1109605).

Almost surely, 2^7581668 is an apocalyptic number.

It is an amenable number.

7581668 is a deficient number, since it is larger than the sum of its proper divisors (5733592).

7581668 is a wasteful number, since it uses less digits than its factorization.

7581668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6766 (or 6764 counting only the distinct ones).

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

The square root of 7581668 is about 2753.4828853654. The cubic root of 7581668 is about 196.4513062768.

The spelling of 7581668 in words is "seven million, five hundred eighty-one thousand, six hundred sixty-eight".