51820704 has 72 divisors (see below), whose sum is σ = 158712372. Its totient is φ = 15943680.

The previous prime is 51820687. The next prime is 51820721. The reversal of 51820704 is 40702815.

It is an interprime number because it is at equal distance from previous prime (51820687) and next prime (51820721).

It can be written as a sum of positive squares in 2 ways, for example, as 47610000 + 4210704 = 6900^2 + 2052^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 3177 + ... + 10664.

Almost surely, 2^51820704 is an apocalyptic number.

It is an amenable number.

51820704 is an abundant number, since it is smaller than the sum of its proper divisors (106891668).

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

51820704 is a wasteful number, since it uses less digits than its factorization.

51820704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13870 (or 13859 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 51820704 is about 7198.6598752823. The cubic root of 51820704 is about 372.8216317337.

The spelling of 51820704 in words is "fifty-one million, eight hundred twenty thousand, seven hundred four".