51689944 has 8 divisors (see below), whose sum is σ = 96918660. Its totient is φ = 25844968.

The previous prime is 51689941. The next prime is 51689969. The reversal of 51689944 is 44998615.

It is a happy number.

51689944 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 51689894 and 51689903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51689941) 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, 3230614 + ... + 3230629.

Almost surely, 2^51689944 is an apocalyptic number.

It is an amenable number.

51689944 is a deficient number, since it is larger than the sum of its proper divisors (45228716).

51689944 is a wasteful number, since it uses less digits than its factorization.

51689944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6461249 (or 6461245 counting only the distinct ones).

The product of its digits is 311040, while the sum is 46.

The square root of 51689944 is about 7189.5718926790. The cubic root of 51689944 is about 372.5077853725.

The spelling of 51689944 in words is "fifty-one million, six hundred eighty-nine thousand, nine hundred forty-four".