51272420 has 48 divisors (see below), whose sum is σ = 110835648. Its totient is φ = 19916160.

The previous prime is 51272399. The next prime is 51272443. The reversal of 51272420 is 2427215.

It is a happy number.

51272420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51272420² = 5257722105312800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110990 + ... + 111450.

It is an arithmetic number, because the mean of its divisors is an integer number (2309076).

Almost surely, 2^51272420 is an apocalyptic number.

It is an amenable number.

51272420 is an abundant number, since it is smaller than the sum of its proper divisors (59563228).

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

51272420 is a wasteful number, since it uses less digits than its factorization.

51272420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620 (or 618 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 51272420 is about 7160.4762411449. The cubic root of 51272420 is about 371.5020991376.

Adding to 51272420 its reverse (2427215), we get a palindrome (53699635).

The spelling of 51272420 in words is "fifty-one million, two hundred seventy-two thousand, four hundred twenty".