51321280 has 112 divisors (see below), whose sum is σ = 134599680. Its totient is φ = 18551808.

The previous prime is 51321253. The next prime is 51321287. The reversal of 51321280 is 8212315.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51321287) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 139657 + ... + 140023.

Almost surely, 2^51321280 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 51321280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67299840).

51321280 is an abundant number, since it is smaller than the sum of its proper divisors (83278400).

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

51321280 is a wasteful number, since it uses less digits than its factorization.

51321280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426 (or 416 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 51321280 is about 7163.8872129592. The cubic root of 51321280 is about 371.6200691870.

Adding to 51321280 its reverse (8212315), we get a palindrome (59533595).

The spelling of 51321280 in words is "fifty-one million, three hundred twenty-one thousand, two hundred eighty".