47640287 has 2 divisors, whose sum is σ = 47640288. Its totient is φ = 47640286.

The previous prime is 47640251. The next prime is 47640331. The reversal of 47640287 is 78204674.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 47640287 - 2⁶ = 47640223 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47640287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47645287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23820143 + 23820144.

It is an arithmetic number, because the mean of its divisors is an integer number (23820144).

Almost surely, 2^47640287 is an apocalyptic number.

47640287 is a deficient number, since it is larger than the sum of its proper divisors (1).

47640287 is an equidigital number, since it uses as much as digits as its factorization.

47640287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 75264, while the sum is 38.

The square root of 47640287 is about 6902.1943612159. The cubic root of 47640287 is about 362.5140053249.

The spelling of 47640287 in words is "forty-seven million, six hundred forty thousand, two hundred eighty-seven".