51680842 has 8 divisors (see below), whose sum is σ = 80194500. Its totient is φ = 24949344.

The previous prime is 51680771. The next prime is 51680843. The reversal of 51680842 is 24808615.

It can be written as a sum of positive squares in 2 ways, for example, as 50424201 + 1256641 = 7101^2 + 1121^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 51680798 and 51680807.

It is not an unprimeable number, because it can be changed into a prime (51680843) 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, 445467 + ... + 445582.

Almost surely, 2^51680842 is an apocalyptic number.

51680842 is a deficient number, since it is larger than the sum of its proper divisors (28513658).

51680842 is a wasteful number, since it uses less digits than its factorization.

51680842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891080.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 51680842 is about 7188.9388646726. The cubic root of 51680842 is about 372.4859193212.

The spelling of 51680842 in words is "fifty-one million, six hundred eighty thousand, eight hundred forty-two".