51266720 has 24 divisors (see below), whose sum is σ = 121118004. Its totient is φ = 20506624.

The previous prime is 51266711. The next prime is 51266723. The reversal of 51266720 is 2766215.

It can be written as a sum of positive squares in 2 ways, for example, as 44568976 + 6697744 = 6676^2 + 2588^2 .

It is not an unprimeable number, because it can be changed into a prime (51266723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 160049 + ... + 160368.

Almost surely, 2^51266720 is an apocalyptic number.

It is an amenable number.

51266720 is an abundant number, since it is smaller than the sum of its proper divisors (69851284).

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

51266720 is a wasteful number, since it uses less digits than its factorization.

51266720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320432 (or 320424 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 51266720 is about 7160.0782118633. The cubic root of 51266720 is about 371.4883318891.

The spelling of 51266720 in words is "fifty-one million, two hundred sixty-six thousand, seven hundred twenty".