51252380 has 12 divisors (see below), whose sum is σ = 107630040. Its totient is φ = 20500944.

The previous prime is 51252379. The next prime is 51252391. The reversal of 51252380 is 8325215.

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 3 ways as a sum of consecutive naturals, for example, 1281290 + ... + 1281329.

It is an arithmetic number, because the mean of its divisors is an integer number (8969170).

Almost surely, 2^51252380 is an apocalyptic number.

It is an amenable number.

51252380 is an abundant number, since it is smaller than the sum of its proper divisors (56377660).

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

51252380 is a wasteful number, since it uses less digits than its factorization.

51252380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2562628 (or 2562626 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51252380 is about 7159.0767561188. The cubic root of 51252380 is about 371.4536918767.

Adding to 51252380 its reverse (8325215), we get a palindrome (59577595).

The spelling of 51252380 in words is "fifty-one million, two hundred fifty-two thousand, three hundred eighty".