51004644 has 12 divisors (see below), whose sum is σ = 119010864. Its totient is φ = 17001544.

The previous prime is 51004643. The next prime is 51004661. The reversal of 51004644 is 44640015.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (51004643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2125182 + ... + 2125205.

It is an arithmetic number, because the mean of its divisors is an integer number (9917572).

Almost surely, 2^51004644 is an apocalyptic number.

It is an amenable number.

51004644 is an abundant number, since it is smaller than the sum of its proper divisors (68006220).

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

51004644 is a wasteful number, since it uses less digits than its factorization.

51004644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4250394 (or 4250392 counting only the distinct ones).

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

The square root of 51004644 is about 7141.7535661769. The cubic root of 51004644 is about 370.8542327600.

Adding to 51004644 its reverse (44640015), we get a palindrome (95644659).

The spelling of 51004644 in words is "fifty-one million, four thousand, six hundred forty-four".