51104640 has 128 divisors (see below), whose sum is σ = 166953600. Its totient is φ = 13289472.

The previous prime is 51104639. The next prime is 51104657. The reversal of 51104640 is 4640115.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×51104640² = 5223368459059200, which contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 82251 + ... + 82869.

It is an arithmetic number, because the mean of its divisors is an integer number (1304325).

Almost surely, 2^51104640 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 51104640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83476800).

51104640 is an abundant number, since it is smaller than the sum of its proper divisors (115848960).

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

51104640 is a wasteful number, since it uses less digits than its factorization.

51104640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51104640 is about 7148.7509398496. The cubic root of 51104640 is about 371.0964311732.

Adding to 51104640 its reverse (4640115), we get a palindrome (55744755).

The spelling of 51104640 in words is "fifty-one million, one hundred four thousand, six hundred forty".