51363920 has 20 divisors (see below), whose sum is σ = 119421300. Its totient is φ = 20545536.

The previous prime is 51363913. The next prime is 51363967. The reversal of 51363920 is 2936315.

It can be written as a sum of positive squares in 2 ways, for example, as 22505536 + 28858384 = 4744^2 + 5372^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320945 + ... + 321104.

It is an arithmetic number, because the mean of its divisors is an integer number (5971065).

Almost surely, 2^51363920 is an apocalyptic number.

It is an amenable number.

51363920 is an abundant number, since it is smaller than the sum of its proper divisors (68057380).

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

51363920 is a wasteful number, since it uses less digits than its factorization.

51363920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642062 (or 642056 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 51363920 is about 7166.8626329796. The cubic root of 51363920 is about 371.7229601859.

The spelling of 51363920 in words is "fifty-one million, three hundred sixty-three thousand, nine hundred twenty".