51305004 has 18 divisors (see below), whose sum is σ = 129687740. Its totient is φ = 17101656.

The previous prime is 51304961. The next prime is 51305011. The reversal of 51305004 is 40050315.

51305004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (18).

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 712534 + ... + 712605.

Almost surely, 2^51305004 is an apocalyptic number.

It is an amenable number.

51305004 is an abundant number, since it is smaller than the sum of its proper divisors (78382736).

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

51305004 is a wasteful number, since it uses less digits than its factorization.

51305004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1425149 (or 1425144 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 51305004 is about 7162.7511474293. The cubic root of 51305004 is about 371.5807799113.

Adding to 51305004 its reverse (40050315), we get a palindrome (91355319).

The spelling of 51305004 in words is "fifty-one million, three hundred five thousand, four".