74649647 has 2 divisors, whose sum is σ = 74649648. Its totient is φ = 74649646.

The previous prime is 74649629. The next prime is 74649667. The reversal of 74649647 is 74694647.

It is a weak prime.

It is an emirp because it is prime and its reverse (74694647) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 74649647 - 2¹⁴ = 74633263 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74649607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37324823 + 37324824.

It is an arithmetic number, because the mean of its divisors is an integer number (37324824).

Almost surely, 2^74649647 is an apocalyptic number.

74649647 is a deficient number, since it is larger than the sum of its proper divisors (1).

74649647 is an equidigital number, since it uses as much as digits as its factorization.

74649647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 47.

The square root of 74649647 is about 8640.0027199070. The cubic root of 74649647 is about 421.0586426699.

Subtracting from 74649647 its sum of digits (47), we obtain a square (74649600 = 8640²).

The spelling of 74649647 in words is "seventy-four million, six hundred forty-nine thousand, six hundred forty-seven".