51804649 has 8 divisors (see below), whose sum is σ = 55883520. Its totient is φ = 47739216.

The previous prime is 51804647. The next prime is 51804667. The reversal of 51804649 is 94640815.

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 51804649 - 2¹ = 51804647 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51804647) 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, 5544 + ... + 11590.

It is an arithmetic number, because the mean of its divisors is an integer number (6985440).

Almost surely, 2^51804649 is an apocalyptic number.

It is an amenable number.

51804649 is a deficient number, since it is larger than the sum of its proper divisors (4078871).

51804649 is a wasteful number, since it uses less digits than its factorization.

51804649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6719.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 51804649 is about 7197.5446507820. The cubic root of 51804649 is about 372.7831254412.

The spelling of 51804649 in words is "fifty-one million, eight hundred four thousand, six hundred forty-nine".