51330040 has 64 divisors (see below), whose sum is σ = 118972800. Its totient is φ = 19924608.

The previous prime is 51330031. The next prime is 51330049. The reversal of 51330040 is 4003315.

It is an interprime number because it is at equal distance from previous prime (51330031) and next prime (51330049).

It is a junction number, because it is equal to n+sod(n) for n = 51329996 and 51330023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51330049) 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, 286671 + ... + 286849.

It is an arithmetic number, because the mean of its divisors is an integer number (1858950).

Almost surely, 2^51330040 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 51330040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (59486400).

51330040 is an abundant number, since it is smaller than the sum of its proper divisors (67642760).

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

51330040 is a wasteful number, since it uses less digits than its factorization.

51330040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 360 counting only the distinct ones).

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

The square root of 51330040 is about 7164.4985867819. The cubic root of 51330040 is about 371.6412118566.

Adding to 51330040 its reverse (4003315), we get a palindrome (55333355).

The spelling of 51330040 in words is "fifty-one million, three hundred thirty thousand, forty".