51819664 has 20 divisors (see below), whose sum is σ = 108124156. Its totient is φ = 23916672.

The previous prime is 51819661. The next prime is 51819671. The reversal of 51819664 is 46691815.

It can be written as a sum of positive squares in 2 ways, for example, as 28005264 + 23814400 = 5292^2 + 4880^2 .

It is not an unprimeable number, because it can be changed into a prime (51819661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124359 + ... + 124774.

Almost surely, 2^51819664 is an apocalyptic number.

It is an amenable number.

51819664 is an abundant number, since it is smaller than the sum of its proper divisors (56304492).

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

51819664 is a wasteful number, since it uses less digits than its factorization.

51819664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249154 (or 249148 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 51819664 is about 7198.5876392526. The cubic root of 51819664 is about 372.8191376399.

The spelling of 51819664 in words is "fifty-one million, eight hundred nineteen thousand, six hundred sixty-four".