7645905 has 12 divisors (see below), whose sum is σ = 13252980. Its totient is φ = 4077792.

The previous prime is 7645889. The next prime is 7645909. The reversal of 7645905 is 5095467.

7645905 is a `hidden beast` number, since 7 + 64 + 590 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1535121 + 6110784 = 1239^2 + 2472^2 .

It is not a de Polignac number, because 7645905 - 2⁴ = 7645889 is a prime.

7645905 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 7645905.

It is not an unprimeable number, because it can be changed into a prime (7645909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84910 + ... + 84999.

It is an arithmetic number, because the mean of its divisors is an integer number (1104415).

Almost surely, 2^7645905 is an apocalyptic number.

It is an amenable number.

7645905 is a deficient number, since it is larger than the sum of its proper divisors (5607075).

7645905 is a wasteful number, since it uses less digits than its factorization.

7645905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169920 (or 169917 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 7645905 is about 2765.1229629078. The cubic root of 7645905 is about 197.0045692808.

The spelling of 7645905 in words is "seven million, six hundred forty-five thousand, nine hundred five".