51405280 has 48 divisors (see below), whose sum is σ = 128595600. Its totient is φ = 19351552.

The previous prime is 51405271. The next prime is 51405337. The reversal of 51405280 is 8250415.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6730 + ... + 12169.

It is an arithmetic number, because the mean of its divisors is an integer number (2679075).

Almost surely, 2^51405280 is an apocalyptic number.

It is an amenable number.

51405280 is an abundant number, since it is smaller than the sum of its proper divisors (77190320).

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

51405280 is a wasteful number, since it uses less digits than its factorization.

51405280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18931 (or 18923 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 25.

The square root of 51405280 is about 7169.7475548306. The cubic root of 51405280 is about 371.8227081334.

Adding to 51405280 its reverse (8250415), we get a palindrome (59655695).

The spelling of 51405280 in words is "fifty-one million, four hundred five thousand, two hundred eighty".