7664405 has 16 divisors (see below), whose sum is σ = 10969344. Its totient is φ = 5026560.

The previous prime is 7664369. The next prime is 7664407. The reversal of 7664405 is 5044667.

It is not a de Polignac number, because 7664405 - 2⁶ = 7664341 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7664407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3956 + ... + 5565.

It is an arithmetic number, because the mean of its divisors is an integer number (685584).

Almost surely, 2^7664405 is an apocalyptic number.

It is an amenable number.

7664405 is a deficient number, since it is larger than the sum of its proper divisors (3304939).

7664405 is a wasteful number, since it uses less digits than its factorization.

7664405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 7664405 is about 2768.4661818415. The cubic root of 7664405 is about 197.1633317819.

The spelling of 7664405 in words is "seven million, six hundred sixty-four thousand, four hundred five".