51644747 has 8 divisors (see below), whose sum is σ = 64388352. Its totient is φ = 40242600.

The previous prime is 51644743. The next prime is 51644771. The reversal of 51644747 is 74744615.

It is a happy number.

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 51644747 - 2² = 51644743 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51644747.

It is not an unprimeable number, because it can be changed into a prime (51644743) 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, 335279 + ... + 335432.

It is an arithmetic number, because the mean of its divisors is an integer number (8048544).

Almost surely, 2^51644747 is an apocalyptic number.

51644747 is a deficient number, since it is larger than the sum of its proper divisors (12743605).

51644747 is a wasteful number, since it uses less digits than its factorization.

51644747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670729.

The product of its digits is 94080, while the sum is 38.

The square root of 51644747 is about 7186.4279722265. The cubic root of 51644747 is about 372.3991817603.

The spelling of 51644747 in words is "fifty-one million, six hundred forty-four thousand, seven hundred forty-seven".