51004647 has 10 divisors (see below), whose sum is σ = 76192248. Its totient is φ = 34003044.

The previous prime is 51004643. The next prime is 51004661. The reversal of 51004647 is 74640015.

51004647 is a `hidden beast` number, since 5 + 10 + 0 + 4 + 647 = 666.

It is not a de Polignac number, because 51004647 - 2² = 51004643 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 51004647.

It is a congruent number.

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 9 ways as a sum of consecutive naturals, for example, 314763 + ... + 314924.

Almost surely, 2^51004647 is an apocalyptic number.

51004647 is a deficient number, since it is larger than the sum of its proper divisors (25187601).

51004647 is an equidigital number, since it uses as much as digits as its factorization.

51004647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629699 (or 629690 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 51004647 is about 7141.7537762093. The cubic root of 51004647 is about 370.8542400310.

The spelling of 51004647 in words is "fifty-one million, four thousand, six hundred forty-seven".