51272520 has 128 divisors (see below), whose sum is σ = 172972800. Its totient is φ = 12063744.

The previous prime is 51272519. The next prime is 51272521. The reversal of 51272520 is 2527215.

It is an interprime number because it is at equal distance from previous prime (51272519) and next prime (51272521).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (51272521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35166 + ... + 36594.

It is an arithmetic number, because the mean of its divisors is an integer number (1351350).

Almost surely, 2^51272520 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 51272520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86486400).

51272520 is an abundant number, since it is smaller than the sum of its proper divisors (121700280).

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

51272520 is a wasteful number, since it uses less digits than its factorization.

51272520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1479 (or 1475 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 51272520 is about 7160.4832239172. The cubic root of 51272520 is about 371.5023406591.

Adding to 51272520 its reverse (2527215), we get a palindrome (53799735).

The spelling of 51272520 in words is "fifty-one million, two hundred seventy-two thousand, five hundred twenty".