51480820 has 24 divisors (see below), whose sum is σ = 108678024. Its totient is φ = 20484096.

The previous prime is 51480817. The next prime is 51480827. The reversal of 51480820 is 2808415.

It can be written as a sum of positive squares in 4 ways, for example, as 272484 + 51208336 = 522^2 + 7156^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51480827) 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, 2809 + ... + 10528.

It is an arithmetic number, because the mean of its divisors is an integer number (4528251).

Almost surely, 2^51480820 is an apocalyptic number.

It is an amenable number.

51480820 is an abundant number, since it is smaller than the sum of its proper divisors (57197204).

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

51480820 is a wasteful number, since it uses less digits than its factorization.

51480820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13539 (or 13537 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The square root of 51480820 is about 7175.0135888373. The cubic root of 51480820 is about 372.0047500068.

The spelling of 51480820 in words is "fifty-one million, four hundred eighty thousand, eight hundred twenty".