74489647 has 2 divisors, whose sum is σ = 74489648. Its totient is φ = 74489646.

The previous prime is 74489641. The next prime is 74489677. The reversal of 74489647 is 74698447.

It is a weak prime.

It is an emirp because it is prime and its reverse (74698447) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74489647 - 2²³ = 66101039 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74489647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74489641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37244823 + 37244824.

It is an arithmetic number, because the mean of its divisors is an integer number (37244824).

Almost surely, 2^74489647 is an apocalyptic number.

74489647 is a deficient number, since it is larger than the sum of its proper divisors (1).

74489647 is an equidigital number, since it uses as much as digits as its factorization.

74489647 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1354752, while the sum is 49.

The square root of 74489647 is about 8630.7384967916. The cubic root of 74489647 is about 420.7576027459.

The spelling of 74489647 in words is "seventy-four million, four hundred eighty-nine thousand, six hundred forty-seven".