690165405 has 96 divisors (see below), whose sum is σ = 1349187840. Its totient is φ = 324311040.

The previous prime is 690165391. The next prime is 690165449. The reversal of 690165405 is 504561096.

690165405 is a `hidden beast` number, since 6 + 90 + 165 + 405 = 666.

It is not a de Polignac number, because 690165405 - 2⁷ = 690165277 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 690165405.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1496875 + ... + 1497335.

It is an arithmetic number, because the mean of its divisors is an integer number (14054040).

Almost surely, 2^690165405 is an apocalyptic number.

It is an amenable number.

690165405 is a deficient number, since it is larger than the sum of its proper divisors (659022435).

690165405 is a wasteful number, since it uses less digits than its factorization.

690165405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611 (or 608 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 690165405 is about 26270.9993148338. Note that the first 3 decimals coincide. The cubic root of 690165405 is about 883.7261958035.

Adding to 690165405 its sum of digits (36), we get a square (690165441 = 26271²).

The spelling of 690165405 in words is "six hundred ninety million, one hundred sixty-five thousand, four hundred five".