51645685 has 32 divisors (see below), whose sum is σ = 76769280. Its totient is φ = 32479488.

The previous prime is 51645661. The next prime is 51645701. The reversal of 51645685 is 58654615.

It is a cyclic number.

It is not a de Polignac number, because 51645685 - 2¹³ = 51637493 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101211 + ... + 101719.

It is an arithmetic number, because the mean of its divisors is an integer number (2399040).

Almost surely, 2^51645685 is an apocalyptic number.

It is an amenable number.

51645685 is a deficient number, since it is larger than the sum of its proper divisors (25123595).

51645685 is a wasteful number, since it uses less digits than its factorization.

51645685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its digits is 144000, while the sum is 40.

The square root of 51645685 is about 7186.4932338380. The cubic root of 51645685 is about 372.4014363189.

The spelling of 51645685 in words is "fifty-one million, six hundred forty-five thousand, six hundred eighty-five".