51253730 has 32 divisors (see below), whose sum is σ = 104120640. Its totient is φ = 17993920.

The previous prime is 51253723. The next prime is 51253739. The reversal of 51253730 is 3735215.

It is a self number, because there is not a number n which added to its sum of digits gives 51253730.

It is not an unprimeable number, because it can be changed into a prime (51253739) 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 15 ways as a sum of consecutive naturals, for example, 4844 + ... + 11223.

It is an arithmetic number, because the mean of its divisors is an integer number (3253770).

Almost surely, 2^51253730 is an apocalyptic number.

51253730 is an abundant number, since it is smaller than the sum of its proper divisors (52866910).

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

51253730 is a wasteful number, since it uses less digits than its factorization.

51253730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16114.

The product of its (nonzero) digits is 3150, while the sum is 26.

The square root of 51253730 is about 7159.1710413986. The cubic root of 51253730 is about 371.4569532412.

Adding to 51253730 its reverse (3735215), we get a palindrome (54988945).

The spelling of 51253730 in words is "fifty-one million, two hundred fifty-three thousand, seven hundred thirty".