51303204 has 72 divisors (see below), whose sum is σ = 135440760. Its totient is φ = 16353792.

The previous prime is 51303199. The next prime is 51303209. The reversal of 51303204 is 40230315.

It is an interprime number because it is at equal distance from previous prime (51303199) and next prime (51303209).

It can be written as a sum of positive squares in 4 ways, for example, as 152100 + 51151104 = 390^2 + 7152^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (51303209) 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, 163752 + ... + 164064.

Almost surely, 2^51303204 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 51303204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67720380).

51303204 is an abundant number, since it is smaller than the sum of its proper divisors (84137556).

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

51303204 is a wasteful number, since it uses less digits than its factorization.

51303204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509 (or 504 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 51303204 is about 7162.6254962828. The cubic root of 51303204 is about 371.5764343103.

Adding to 51303204 its reverse (40230315), we get a palindrome (91533519).

The spelling of 51303204 in words is "fifty-one million, three hundred three thousand, two hundred four".