47787257 has 4 divisors (see below), whose sum is σ = 54614016. Its totient is φ = 40960500.

The previous prime is 47787251. The next prime is 47787301. The reversal of 47787257 is 75278774.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75278774 = 2 ⋅37639387.

It is not a de Polignac number, because 47787257 - 2¹⁶ = 47721721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47787251) 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, 3413369 + ... + 3413382.

It is an arithmetic number, because the mean of its divisors is an integer number (13653504).

Almost surely, 2^47787257 is an apocalyptic number.

It is an amenable number.

47787257 is a deficient number, since it is larger than the sum of its proper divisors (6826759).

47787257 is an equidigital number, since it uses as much as digits as its factorization.

47787257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6826758.

The product of its digits is 768320, while the sum is 47.

The square root of 47787257 is about 6912.8327768000. The cubic root of 47787257 is about 362.8864071462.

The spelling of 47787257 in words is "forty-seven million, seven hundred eighty-seven thousand, two hundred fifty-seven".