51717240 has 96 divisors (see below), whose sum is σ = 176950800. Its totient is φ = 13063680.

The previous prime is 51717229. The next prime is 51717251. The reversal of 51717240 is 4271715.

It is an interprime number because it is at equal distance from previous prime (51717229) and next prime (51717251).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3060 + ... + 10620.

Almost surely, 2^51717240 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 51717240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88475400).

51717240 is an abundant number, since it is smaller than the sum of its proper divisors (125233560).

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

51717240 is a wasteful number, since it uses less digits than its factorization.

51717240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7597 (or 7590 counting only the distinct ones).

The product of its (nonzero) digits is 1960, while the sum is 27.

The square root of 51717240 is about 7191.4699470970. The cubic root of 51717240 is about 372.5733441152.

Adding to 51717240 its reverse (4271715), we get a palindrome (55988955).

The spelling of 51717240 in words is "fifty-one million, seven hundred seventeen thousand, two hundred forty".