51266920 has 16 divisors (see below), whose sum is σ = 115350660. Its totient is φ = 20506752.

The previous prime is 51266903. The next prime is 51266927. The reversal of 51266920 is 2966215.

It can be written as a sum of positive squares in 2 ways, for example, as 44328964 + 6937956 = 6658^2 + 2634^2 .

It is not an unprimeable number, because it can be changed into a prime (51266927) 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 3 ways as a sum of consecutive naturals, for example, 640797 + ... + 640876.

Almost surely, 2^51266920 is an apocalyptic number.

It is an amenable number.

51266920 is an abundant number, since it is smaller than the sum of its proper divisors (64083740).

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

51266920 is a wasteful number, since it uses less digits than its factorization.

51266920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1281684 (or 1281680 counting only the distinct ones).

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

The square root of 51266920 is about 7160.0921781776. The cubic root of 51266920 is about 371.4888149677.

The spelling of 51266920 in words is "fifty-one million, two hundred sixty-six thousand, nine hundred twenty".