51280685 has 16 divisors (see below), whose sum is σ = 64817280. Its totient is φ = 38871360.

The previous prime is 51280681. The next prime is 51280693. The reversal of 51280685 is 58608215.

It is a happy number.

It is not a de Polignac number, because 51280685 - 2² = 51280681 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51280681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10490 + ... + 14580.

It is an arithmetic number, because the mean of its divisors is an integer number (4051080).

Almost surely, 2^51280685 is an apocalyptic number.

It is an amenable number.

51280685 is a deficient number, since it is larger than the sum of its proper divisors (13536595).

51280685 is a wasteful number, since it uses less digits than its factorization.

51280685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4228.

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 51280685 is about 7161.0533443063. The cubic root of 51280685 is about 371.5220598356.

The spelling of 51280685 in words is "fifty-one million, two hundred eighty thousand, six hundred eighty-five".