51250040 has 32 divisors (see below), whose sum is σ = 116100000. Its totient is φ = 20360064.

The previous prime is 51250013. The next prime is 51250057. The reversal of 51250040 is 4005215.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 1661 + ... + 10259.

It is an arithmetic number, because the mean of its divisors is an integer number (3628125).

Almost surely, 2^51250040 is an apocalyptic number.

It is an amenable number.

51250040 is an abundant number, since it is smaller than the sum of its proper divisors (64849960).

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

51250040 is a wasteful number, since it uses less digits than its factorization.

51250040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8759 (or 8755 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 17.

The square root of 51250040 is about 7158.9133253588. The cubic root of 51250040 is about 371.4480387092.

Adding to 51250040 its reverse (4005215), we get a palindrome (55255255).

The spelling of 51250040 in words is "fifty-one million, two hundred fifty thousand, forty".