51765920 has 24 divisors (see below), whose sum is σ = 122297364. Its totient is φ = 20706304.

The previous prime is 51765919. The next prime is 51765929. The reversal of 51765920 is 2956715.

It can be written as a sum of positive squares in 2 ways, for example, as 47389456 + 4376464 = 6884^2 + 2092^2 .

It is not an unprimeable number, because it can be changed into a prime (51765929) 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, 161609 + ... + 161928.

Almost surely, 2^51765920 is an apocalyptic number.

It is an amenable number.

51765920 is an abundant number, since it is smaller than the sum of its proper divisors (70531444).

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

51765920 is a wasteful number, since it uses less digits than its factorization.

51765920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323552 (or 323544 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 51765920 is about 7194.8537163726. The cubic root of 51765920 is about 372.6902051000.

The spelling of 51765920 in words is "fifty-one million, seven hundred sixty-five thousand, nine hundred twenty".