51280686 has 12 divisors (see below), whose sum is σ = 111108192. Its totient is φ = 17093556.

The previous prime is 51280681. The next prime is 51280693. The reversal of 51280686 is 68608215.

It is a happy number.

51280686 is a `hidden beast` number, since 512 + 80 + 68 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51280686.

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 5 ways as a sum of consecutive naturals, for example, 1424446 + ... + 1424481.

It is an arithmetic number, because the mean of its divisors is an integer number (9259016).

Almost surely, 2^51280686 is an apocalyptic number.

51280686 is an abundant number, since it is smaller than the sum of its proper divisors (59827506).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51280686 is a wasteful number, since it uses less digits than its factorization.

51280686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2848935 (or 2848932 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 51280686 is about 7161.0534141284. The cubic root of 51280686 is about 371.5220622505.

The spelling of 51280686 in words is "fifty-one million, two hundred eighty thousand, six hundred eighty-six".