51680564 has 24 divisors (see below), whose sum is σ = 100034088. Its totient is φ = 23207040.

The previous prime is 51680557. The next prime is 51680567. The reversal of 51680564 is 46508615.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 672400 + 51008164 = 820^2 + 7142^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51680567) 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 7 ways as a sum of consecutive naturals, for example, 11507 + ... + 15354.

It is an arithmetic number, because the mean of its divisors is an integer number (4168087).

Almost surely, 2^51680564 is an apocalyptic number.

It is an amenable number.

51680564 is a deficient number, since it is larger than the sum of its proper divisors (48353524).

51680564 is a wasteful number, since it uses less digits than its factorization.

51680564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26915 (or 26913 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 51680564 is about 7188.9195293869. The cubic root of 51680564 is about 372.4852514317.

The spelling of 51680564 in words is "fifty-one million, six hundred eighty thousand, five hundred sixty-four".