51224004 has 36 divisors (see below), whose sum is σ = 139444396. Its totient is φ = 15761088.

The previous prime is 51223973. The next prime is 51224029. The reversal of 51224004 is 40042215.

51224004 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 9000000 + 42224004 = 3000^2 + 6498^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 54259 + ... + 55194.

Almost surely, 2^51224004 is an apocalyptic number.

It is an amenable number.

51224004 is an abundant number, since it is smaller than the sum of its proper divisors (88220392).

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

51224004 is a wasteful number, since it uses less digits than its factorization.

51224004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109476 (or 109471 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 51224004 is about 7157.0946619421. The cubic root of 51224004 is about 371.3851271532.

Adding to 51224004 its reverse (40042215), we get a palindrome (91266219).

The spelling of 51224004 in words is "fifty-one million, two hundred twenty-four thousand, four".