51609344 has 18 divisors (see below), whose sum is σ = 103017600. Its totient is φ = 25804544.

The previous prime is 51609343. The next prime is 51609347. The reversal of 51609344 is 44390615.

It is a super-2 number, since 2×51609344² = 5327048776220672, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 51609344.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51609343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100544 + ... + 101055.

It is an arithmetic number, because the mean of its divisors is an integer number (5723200).

Almost surely, 2^51609344 is an apocalyptic number.

It is an amenable number.

51609344 is a deficient number, since it is larger than the sum of its proper divisors (51408256).

51609344 is an equidigital number, since it uses as much as digits as its factorization.

51609344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201615 (or 201601 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 51609344 is about 7183.9643651677. The cubic root of 51609344 is about 372.3140678314.

Adding to 51609344 its reverse (44390615), we get a palindrome (95999959).

The spelling of 51609344 in words is "fifty-one million, six hundred nine thousand, three hundred forty-four".