7890705 has 12 divisors (see below), whose sum is σ = 13677300. Its totient is φ = 4208352.

The previous prime is 7890691. The next prime is 7890713. The reversal of 7890705 is 5070987.

It can be written as a sum of positive squares in 2 ways, for example, as 5919489 + 1971216 = 2433^2 + 1404^2 .

It is not a de Polignac number, because 7890705 - 2¹⁰ = 7889681 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 7890705.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87630 + ... + 87719.

It is an arithmetic number, because the mean of its divisors is an integer number (1139775).

Almost surely, 2^7890705 is an apocalyptic number.

It is an amenable number.

7890705 is a deficient number, since it is larger than the sum of its proper divisors (5786595).

7890705 is a wasteful number, since it uses less digits than its factorization.

7890705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175360 (or 175357 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 36.

The square root of 7890705 is about 2809.0398715575. The cubic root of 7890705 is about 199.0850288556.

The spelling of 7890705 in words is "seven million, eight hundred ninety thousand, seven hundred five".