51263280 has 160 divisors (see below), whose sum is σ = 179363520. Its totient is φ = 13623552.

The previous prime is 51263269. The next prime is 51263287. The reversal of 51263280 is 8236215.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (51263287) 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, 174814 + ... + 175106.

It is an arithmetic number, because the mean of its divisors is an integer number (1121022).

Almost surely, 2^51263280 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 51263280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89681760).

51263280 is an abundant number, since it is smaller than the sum of its proper divisors (128100240).

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

51263280 is an equidigital number, since it uses as much as digits as its factorization.

51263280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 51263280 is about 7159.8379869938. The cubic root of 51263280 is about 371.4800227401.

Adding to 51263280 its reverse (8236215), we get a palindrome (59499495).

The spelling of 51263280 in words is "fifty-one million, two hundred sixty-three thousand, two hundred eighty".