51256636 has 6 divisors (see below), whose sum is σ = 89699120. Its totient is φ = 25628316.

The previous prime is 51256589. The next prime is 51256637. The reversal of 51256636 is 63665215.

51256636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51256637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6407076 + ... + 6407083.

Almost surely, 2^51256636 is an apocalyptic number.

It is an amenable number.

51256636 is a deficient number, since it is larger than the sum of its proper divisors (38442484).

51256636 is a wasteful number, since it uses less digits than its factorization.

51256636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12814163 (or 12814161 counting only the distinct ones).

The product of its digits is 32400, while the sum is 34.

The square root of 51256636 is about 7159.3739949803. The cubic root of 51256636 is about 371.4639734360.

It can be divided in two parts, 5 and 1256636, that added together give a square (1256641 = 1121²).

The spelling of 51256636 in words is "fifty-one million, two hundred fifty-six thousand, six hundred thirty-six".