51783620 has 48 divisors (see below), whose sum is σ = 124940928. Its totient is φ = 17660160.

The previous prime is 51783587. The next prime is 51783629. The reversal of 51783620 is 2638715.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (51783629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28664 + ... + 30416.

It is an arithmetic number, because the mean of its divisors is an integer number (2602936).

Almost surely, 2^51783620 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 51783620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62470464).

51783620 is an abundant number, since it is smaller than the sum of its proper divisors (73157308).

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

51783620 is a wasteful number, since it uses less digits than its factorization.

51783620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980 (or 1978 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 51783620 is about 7196.0836571013. The cubic root of 51783620 is about 372.7326774765.

The spelling of 51783620 in words is "fifty-one million, seven hundred eighty-three thousand, six hundred twenty".