47656729 has 4 divisors (see below), whose sum is σ = 50460084. Its totient is φ = 44853376.

The previous prime is 47656727. The next prime is 47656783. The reversal of 47656729 is 92765674.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92765674 = 2 ⋅46382837.

It can be written as a sum of positive squares in 2 ways, for example, as 20115225 + 27541504 = 4485^2 + 5248^2 .

It is a cyclic number.

It is not a de Polignac number, because 47656729 - 2¹ = 47656727 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47656727) 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, 1401652 + ... + 1401685.

It is an arithmetic number, because the mean of its divisors is an integer number (12615021).

Almost surely, 2^47656729 is an apocalyptic number.

It is an amenable number.

47656729 is a deficient number, since it is larger than the sum of its proper divisors (2803355).

47656729 is a wasteful number, since it uses less digits than its factorization.

47656729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2803354.

The product of its digits is 635040, while the sum is 46.

The square root of 47656729 is about 6903.3853289527. The cubic root of 47656729 is about 362.5557051136. Note that the first 3 decimals are identical.

The spelling of 47656729 in words is "forty-seven million, six hundred fifty-six thousand, seven hundred twenty-nine".