51042040 has 64 divisors (see below), whose sum is σ = 131866560. Its totient is φ = 17418240.

The previous prime is 51041957. The next prime is 51042053. The reversal of 51042040 is 4024015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117664 + ... + 118096.

It is an arithmetic number, because the mean of its divisors is an integer number (2060415).

Almost surely, 2^51042040 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 51042040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65933280).

51042040 is an abundant number, since it is smaller than the sum of its proper divisors (80824520).

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

51042040 is a wasteful number, since it uses less digits than its factorization.

51042040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 872 (or 868 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 51042040 is about 7144.3712109604. The cubic root of 51042040 is about 370.9448459264.

Adding to 51042040 its reverse (4024015), we get a palindrome (55066055).

The spelling of 51042040 in words is "fifty-one million, forty-two thousand, forty".