47729457 has 12 divisors (see below), whose sum is σ = 69470544. Its totient is φ = 31575960.

The previous prime is 47729449. The next prime is 47729459. The reversal of 47729457 is 75492774.

It is not a de Polignac number, because 47729457 - 2³ = 47729449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (47729459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19063 + ... + 21420.

It is an arithmetic number, because the mean of its divisors is an integer number (5789212).

Almost surely, 2^47729457 is an apocalyptic number.

It is an amenable number.

47729457 is a deficient number, since it is larger than the sum of its proper divisors (21741087).

47729457 is a wasteful number, since it uses less digits than its factorization.

47729457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40620 (or 40617 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 47729457 is about 6908.6508813226. The cubic root of 47729457 is about 362.7400410932.

The spelling of 47729457 in words is "forty-seven million, seven hundred twenty-nine thousand, four hundred fifty-seven".