51395520 has 224 divisors, whose sum is σ = 184928256. Its totient is φ = 11980800.

The previous prime is 51395497. The next prime is 51395521. The reversal of 51395520 is 2559315.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51395521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 327282 + ... + 327438.

Almost surely, 2^51395520 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 51395520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92464128).

51395520 is an abundant number, since it is smaller than the sum of its proper divisors (133532736).

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

51395520 is a wasteful number, since it uses less digits than its factorization.

51395520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 209 counting only the distinct ones).

The product of its (nonzero) digits is 6750, while the sum is 30.

The square root of 51395520 is about 7169.0668848882. The cubic root of 51395520 is about 371.7991747576.

It can be divided in two parts, 51395 and 520, that added together give a palindrome (51915).

The spelling of 51395520 in words is "fifty-one million, three hundred ninety-five thousand, five hundred twenty".