6665790 has 16 divisors (see below), whose sum is σ = 15997968. Its totient is φ = 1777536.

The previous prime is 6665777. The next prime is 6665797. The reversal of 6665790 is 975666.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6665797) 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, 111067 + ... + 111126.

It is an arithmetic number, because the mean of its divisors is an integer number (999873).

Almost surely, 2^6665790 is an apocalyptic number.

6665790 is an abundant number, since it is smaller than the sum of its proper divisors (9332178).

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

6665790 is a wasteful number, since it uses less digits than its factorization.

6665790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222203.

The product of its (nonzero) digits is 68040, while the sum is 39.

The square root of 6665790 is about 2581.8191261202. The cubic root of 6665790 is about 188.1989556654.

It can be divided in two parts, 66 and 65790, that added together give a palindrome (65856).

The spelling of 6665790 in words is "six million, six hundred sixty-five thousand, seven hundred ninety".