51116240 has 80 divisors (see below), whose sum is σ = 139550592. Its totient is φ = 17044992.

The previous prime is 51116173. The next prime is 51116249. The reversal of 51116240 is 4261115.

51116240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×51116240² = 5225739983475200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51116249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19487 + ... + 21953.

Almost surely, 2^51116240 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 51116240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69775296).

51116240 is an abundant number, since it is smaller than the sum of its proper divisors (88434352).

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

51116240 is a wasteful number, since it uses less digits than its factorization.

51116240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2524 (or 2518 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 51116240 is about 7149.5622243603. The cubic root of 51116240 is about 371.1245068557.

Adding to 51116240 its reverse (4261115), we get a palindrome (55377355).

The spelling of 51116240 in words is "fifty-one million, one hundred sixteen thousand, two hundred forty".