51283520 has 56 divisors (see below), whose sum is σ = 124992384. Its totient is φ = 20030976.

The previous prime is 51283511. The next prime is 51283523. The reversal of 51283520 is 2538215.

It is a self number, because there is not a number n which added to its sum of digits gives 51283520.

It is not an unprimeable number, because it can be changed into a prime (51283523) 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, 11897 + ... + 15623.

Almost surely, 2^51283520 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 51283520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62496192).

51283520 is an abundant number, since it is smaller than the sum of its proper divisors (73708864).

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

51283520 is a wasteful number, since it uses less digits than its factorization.

51283520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3787 (or 3777 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 51283520 is about 7161.2512873101. The cubic root of 51283520 is about 371.5289061146.

The spelling of 51283520 in words is "fifty-one million, two hundred eighty-three thousand, five hundred twenty".