51605332 has 24 divisors (see below), whose sum is σ = 92939616. Its totient is φ = 25058208.

The previous prime is 51605321. The next prime is 51605339. The reversal of 51605332 is 23350615.

It is a happy number.

It is a super-2 number, since 2×51605332² = 5326220581660448, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51605297 and 51605306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51605339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33123 + ... + 34645.

It is an arithmetic number, because the mean of its divisors is an integer number (3872484).

Almost surely, 2^51605332 is an apocalyptic number.

It is an amenable number.

51605332 is a deficient number, since it is larger than the sum of its proper divisors (41334284).

51605332 is a wasteful number, since it uses less digits than its factorization.

51605332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1767 (or 1765 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 25.

The square root of 51605332 is about 7183.6851267299. The cubic root of 51605332 is about 372.3044199483.

Adding to 51605332 its reverse (23350615), we get a palindrome (74955947).

The spelling of 51605332 in words is "fifty-one million, six hundred five thousand, three hundred thirty-two".