51965920 has 48 divisors (see below), whose sum is σ = 126741888. Its totient is φ = 20113920.

The previous prime is 51965899. The next prime is 51965929. The reversal of 51965920 is 2956915.

It is a self number, because there is not a number n which added to its sum of digits gives 51965920.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51965929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 279 + ... + 10198.

It is an arithmetic number, because the mean of its divisors is an integer number (2640456).

Almost surely, 2^51965920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51965920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63370944).

51965920 is an abundant number, since it is smaller than the sum of its proper divisors (74775968).

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

51965920 is a wasteful number, since it uses less digits than its factorization.

51965920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10523 (or 10515 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 37.

The square root of 51965920 is about 7208.7391407929. The cubic root of 51965920 is about 373.1695568487.

The spelling of 51965920 in words is "fifty-one million, nine hundred sixty-five thousand, nine hundred twenty".