51917040 has 120 divisors (see below), whose sum is σ = 199281888. Its totient is φ = 11865600.

The previous prime is 51917023. The next prime is 51917057. The reversal of 51917040 is 4071915.

It is an interprime number because it is at equal distance from previous prime (51917023) and next prime (51917057).

It is a tau number, because it is divible by the number of its divisors (120).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 51916995 and 51917013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 111 + ... + 10190.

Almost surely, 2^51917040 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 51917040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99640944).

51917040 is an abundant number, since it is smaller than the sum of its proper divisors (147364848).

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

51917040 is a wasteful number, since it uses less digits than its factorization.

51917040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10327 (or 10318 counting only the distinct ones).

The product of its (nonzero) digits is 1260, while the sum is 27.

The square root of 51917040 is about 7205.3480138020. The cubic root of 51917040 is about 373.0525170013.

Adding to 51917040 its reverse (4071915), we get a palindrome (55988955).

The spelling of 51917040 in words is "fifty-one million, nine hundred seventeen thousand, forty".