51326540 has 12 divisors (see below), whose sum is σ = 107785776. Its totient is φ = 20530608.

The previous prime is 51326533. The next prime is 51326573. The reversal of 51326540 is 4562315.

51326540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283144 + ... + 1283183.

It is an arithmetic number, because the mean of its divisors is an integer number (8982148).

Almost surely, 2^51326540 is an apocalyptic number.

It is an amenable number.

51326540 is an abundant number, since it is smaller than the sum of its proper divisors (56459236).

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

51326540 is a wasteful number, since it uses less digits than its factorization.

51326540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2566336 (or 2566334 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 51326540 is about 7164.2543226773. The cubic root of 51326540 is about 371.6327647315.

Adding to 51326540 its reverse (4562315), we get a palindrome (55888855).

The spelling of 51326540 in words is "fifty-one million, three hundred twenty-six thousand, five hundred forty".