47712721 has 12 divisors (see below), whose sum is σ = 57004788. Its totient is φ = 39789792.

The previous prime is 47712697. The next prime is 47712733. The reversal of 47712721 is 12721774.

It can be written as a sum of positive squares in 2 ways, for example, as 37344321 + 10368400 = 6111^2 + 3220^2 .

It is not a de Polignac number, because 47712721 - 2⁹ = 47712209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47712521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11346 + ... + 14971.

It is an arithmetic number, because the mean of its divisors is an integer number (4750399).

Almost surely, 2^47712721 is an apocalyptic number.

It is an amenable number.

47712721 is a deficient number, since it is larger than the sum of its proper divisors (9292067).

47712721 is a wasteful number, since it uses less digits than its factorization.

47712721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26368 (or 26361 counting only the distinct ones).

The product of its digits is 5488, while the sum is 31.

The square root of 47712721 is about 6907.4395400901. The cubic root of 47712721 is about 362.6976387180.

The spelling of 47712721 in words is "forty-seven million, seven hundred twelve thousand, seven hundred twenty-one".