51605232 has 120 divisors (see below), whose sum is σ = 159538896. Its totient is φ = 14321664.

The previous prime is 51605231. The next prime is 51605237. The reversal of 51605232 is 23250615.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51605231) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 86728 + ... + 87320.

Almost surely, 2^51605232 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 51605232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79769448).

51605232 is an abundant number, since it is smaller than the sum of its proper divisors (107933664).

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

51605232 is a wasteful number, since it uses less digits than its factorization.

51605232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655 (or 642 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 51605232 is about 7183.6781665105. The cubic root of 51605232 is about 372.3041794663.

Adding to 51605232 its reverse (23250615), we get a palindrome (74855847).

The spelling of 51605232 in words is "fifty-one million, six hundred five thousand, two hundred thirty-two".