51303040 has 64 divisors (see below), whose sum is σ = 129132000. Its totient is φ = 19436544.

The previous prime is 51302989. The next prime is 51303061. The reversal of 51303040 is 4030315.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10051 + ... + 14269.

Almost surely, 2^51303040 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 51303040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64566000).

51303040 is an abundant number, since it is smaller than the sum of its proper divisors (77828960).

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

51303040 is a wasteful number, since it uses less digits than its factorization.

51303040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4257 (or 4245 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 51303040 is about 7162.6140479576. The cubic root of 51303040 is about 371.5760383727.

Adding to 51303040 its reverse (4030315), we get a palindrome (55333355).

The spelling of 51303040 in words is "fifty-one million, three hundred three thousand, forty".