51243504 has 60 divisors (see below), whose sum is σ = 143368056. Its totient is φ = 15764736.

The previous prime is 51243503. The next prime is 51243523. The reversal of 51243504 is 40534215.

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 (51243503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4954 + ... + 11270.

Almost surely, 2^51243504 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 51243504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71684028).

51243504 is an abundant number, since it is smaller than the sum of its proper divisors (92124552).

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

51243504 is a wasteful number, since it uses less digits than its factorization.

51243504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6354 (or 6335 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 51243504 is about 7158.4568169404. The cubic root of 51243504 is about 371.4322475827.

Adding to 51243504 its reverse (40534215), we get a palindrome (91777719).

The spelling of 51243504 in words is "fifty-one million, two hundred forty-three thousand, five hundred four".