51480640 has 28 divisors (see below), whose sum is σ = 122589036. Its totient is φ = 20592128.

The previous prime is 51480623. The next prime is 51480643. The reversal of 51480640 is 4608415.

It can be written as a sum of positive squares in 2 ways, for example, as 28132416 + 23348224 = 5304^2 + 4832^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51480599 and 51480608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51480643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80119 + ... + 80758.

Almost surely, 2^51480640 is an apocalyptic number.

It is an amenable number.

51480640 is an abundant number, since it is smaller than the sum of its proper divisors (71108396).

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

51480640 is a wasteful number, since it uses less digits than its factorization.

51480640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160894 (or 160884 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 51480640 is about 7175.0010452961. The cubic root of 51480640 is about 372.0043164412.

The spelling of 51480640 in words is "fifty-one million, four hundred eighty thousand, six hundred forty".