51250540 has 72 divisors (see below), whose sum is σ = 122037552. Its totient is φ = 17928960.

The previous prime is 51250519. The next prime is 51250541. The reversal of 51250540 is 4505215.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (51250541) 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 23 ways as a sum of consecutive naturals, for example, 184882 + ... + 185158.

It is an arithmetic number, because the mean of its divisors is an integer number (1694966).

Almost surely, 2^51250540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51250540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61018776).

51250540 is an abundant number, since it is smaller than the sum of its proper divisors (70787012).

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

51250540 is a wasteful number, since it uses less digits than its factorization.

51250540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 355 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 51250540 is about 7158.9482467748. The cubic root of 51250540 is about 371.4492466654.

Adding to 51250540 its reverse (4505215), we get a palindrome (55755755).

The spelling of 51250540 in words is "fifty-one million, two hundred fifty thousand, five hundred forty".