51638984 has 8 divisors (see below), whose sum is σ = 96823110. Its totient is φ = 25819488.

The previous prime is 51638971. The next prime is 51638987. The reversal of 51638984 is 48983615.

51638984 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 47914084 + 3724900 = 6922^2 + 1930^2 .

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

It is not an unprimeable number, because it can be changed into a prime (51638987) 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, 3227429 + ... + 3227444.

Almost surely, 2^51638984 is an apocalyptic number.

It is an amenable number.

51638984 is a deficient number, since it is larger than the sum of its proper divisors (45184126).

51638984 is a wasteful number, since it uses less digits than its factorization.

51638984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6454879 (or 6454875 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 51638984 is about 7186.0269968878. The cubic root of 51638984 is about 372.3853293265.

The spelling of 51638984 in words is "fifty-one million, six hundred thirty-eight thousand, nine hundred eighty-four".