51563646 has 12 divisors (see below), whose sum is σ = 111721272. Its totient is φ = 17187876.

The previous prime is 51563627. The next prime is 51563671. The reversal of 51563646 is 64636515.

51563646 is a `hidden beast` number, since 5 + 1 + 5 + 6 + 3 + 646 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51563646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1432306 + ... + 1432341.

It is an arithmetic number, because the mean of its divisors is an integer number (9310106).

Almost surely, 2^51563646 is an apocalyptic number.

51563646 is an abundant number, since it is smaller than the sum of its proper divisors (60157626).

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

51563646 is a wasteful number, since it uses less digits than its factorization.

51563646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2864655 (or 2864652 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

The square root of 51563646 is about 7180.7831049266. The cubic root of 51563646 is about 372.2041456664.

It can be divided in two parts, 5 and 1563646, that added together give a palindrome (1563651).

The spelling of 51563646 in words is "fifty-one million, five hundred sixty-three thousand, six hundred forty-six".