6660407 has 16 divisors (see below), whose sum is σ = 7520352. Its totient is φ = 5857920.

The previous prime is 6660397. The next prime is 6660419. The reversal of 6660407 is 7040666.

It is a cyclic number.

It is not a de Polignac number, because 6660407 - 2⁴ = 6660391 is a prime.

It is a super-2 number, since 2×6660407² = 88722042811298, which contains 22 as substring.

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 6660407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6660427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29228 + ... + 29454.

It is an arithmetic number, because the mean of its divisors is an integer number (470022).

Almost surely, 2^6660407 is an apocalyptic number.

6660407 is a deficient number, since it is larger than the sum of its proper divisors (859945).

6660407 is a wasteful number, since it uses less digits than its factorization.

6660407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338.

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 6660407 is about 2580.7764335564. The cubic root of 6660407 is about 188.1482816115.

The spelling of 6660407 in words is "six million, six hundred sixty thousand, four hundred seven".