51339280 has 40 divisors (see below), whose sum is σ = 123485400. Its totient is φ = 19826688.

The previous prime is 51339271. The next prime is 51339329. The reversal of 51339280 is 8293315.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 17606416 + 33732864 = 4196^2 + 5808^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 8745 + ... + 13384.

It is an arithmetic number, because the mean of its divisors is an integer number (3087135).

Almost surely, 2^51339280 is an apocalyptic number.

It is an amenable number.

51339280 is an abundant number, since it is smaller than the sum of its proper divisors (72146120).

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

51339280 is a wasteful number, since it uses less digits than its factorization.

51339280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22171 (or 22165 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 51339280 is about 7165.1434040080. The cubic root of 51339280 is about 371.6635104221.

It can be divided in two parts, 513 and 39280, that added together give a palindrome (39793).

The spelling of 51339280 in words is "fifty-one million, three hundred thirty-nine thousand, two hundred eighty".