51044540 has 24 divisors (see below), whose sum is σ = 113499792. Its totient is φ = 19216640.

The previous prime is 51044533. The next prime is 51044551. The reversal of 51044540 is 4544015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74726 + ... + 75405.

It is an arithmetic number, because the mean of its divisors is an integer number (4729158).

Almost surely, 2^51044540 is an apocalyptic number.

It is an amenable number.

51044540 is an abundant number, since it is smaller than the sum of its proper divisors (62455252).

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

51044540 is a wasteful number, since it uses less digits than its factorization.

51044540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150157 (or 150155 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 51044540 is about 7144.5461717313. The cubic root of 51044540 is about 370.9509020256.

Adding to 51044540 its reverse (4544015), we get a palindrome (55588555).

The spelling of 51044540 in words is "fifty-one million, forty-four thousand, five hundred forty".