51245280 has 144 divisors (see below), whose sum is σ = 184176720. Its totient is φ = 12939264.

The previous prime is 51245273. The next prime is 51245309. The reversal of 51245280 is 8254215.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26424 + ... + 28296.

It is an arithmetic number, because the mean of its divisors is an integer number (1279005).

Almost surely, 2^51245280 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 51245280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92088360).

51245280 is an abundant number, since it is smaller than the sum of its proper divisors (132931440).

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

51245280 is a wasteful number, since it uses less digits than its factorization.

51245280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1913 (or 1902 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 51245280 is about 7158.5808649480. The cubic root of 51245280 is about 371.4365385724.

Adding to 51245280 its reverse (8254215), we get a palindrome (59499495).

It can be divided in two parts, 5124 and 5280, that added together give a square (10404 = 102²).

The spelling of 51245280 in words is "fifty-one million, two hundred forty-five thousand, two hundred eighty".