51604224 has 144 divisors (see below), whose sum is σ = 162865920. Its totient is φ = 14192640.

The previous prime is 51604219. The next prime is 51604229. The reversal of 51604224 is 42240615.

It is an interprime number because it is at equal distance from previous prime (51604219) and next prime (51604229).

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

It is a junction number, because it is equal to n+sod(n) for n = 51604194 and 51604203.

It is not an unprimeable number, because it can be changed into a prime (51604229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155739 + ... + 156069.

Almost surely, 2^51604224 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 51604224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81432960).

51604224 is an abundant number, since it is smaller than the sum of its proper divisors (111261696).

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

51604224 is a wasteful number, since it uses less digits than its factorization.

51604224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 51604224 is about 7183.6080071229. The cubic root of 51604224 is about 372.3017553900.

Adding to 51604224 its reverse (42240615), we get a palindrome (93844839).

The spelling of 51604224 in words is "fifty-one million, six hundred four thousand, two hundred twenty-four".