51711040 has 56 divisors (see below), whose sum is σ = 125501400. Its totient is φ = 20287488.

The previous prime is 51711029. The next prime is 51711041. The reversal of 51711040 is 4011715.

It can be written as a sum of positive squares in 4 ways, for example, as 2262016 + 49449024 = 1504^2 + 7032^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51710999 and 51711017.

It is not an unprimeable number, because it can be changed into a prime (51711041) 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, 15436 + ... + 18484.

Almost surely, 2^51711040 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 51711040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62750700).

51711040 is an abundant number, since it is smaller than the sum of its proper divisors (73790360).

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

51711040 is a wasteful number, since it uses less digits than its factorization.

51711040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119 (or 3109 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 51711040 is about 7191.0388679244. The cubic root of 51711040 is about 372.5584551598.

Adding to 51711040 its reverse (4011715), we get a palindrome (55722755).

The spelling of 51711040 in words is "fifty-one million, seven hundred eleven thousand, forty".