51647689 has 8 divisors (see below), whose sum is σ = 52859520. Its totient is φ = 50440656.

The previous prime is 51647669. The next prime is 51647693. The reversal of 51647689 is 98674615.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51647689 - 2⁵ = 51647657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51647669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29367 + ... + 31075.

It is an arithmetic number, because the mean of its divisors is an integer number (6607440).

Almost surely, 2^51647689 is an apocalyptic number.

It is an amenable number.

51647689 is a deficient number, since it is larger than the sum of its proper divisors (1211831).

51647689 is a wasteful number, since it uses less digits than its factorization.

51647689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399.

The product of its digits is 362880, while the sum is 46.

The square root of 51647689 is about 7186.6326607111. The cubic root of 51647689 is about 372.4062530028.

It can be divided in two parts, 516 and 47689, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 51647689 in words is "fifty-one million, six hundred forty-seven thousand, six hundred eighty-nine".