74428247 has 2 divisors, whose sum is σ = 74428248. Its totient is φ = 74428246.

The previous prime is 74428231. The next prime is 74428259. The reversal of 74428247 is 74282447.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 74428247 - 2⁴ = 74428231 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 74428247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74428217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37214123 + 37214124.

It is an arithmetic number, because the mean of its divisors is an integer number (37214124).

Almost surely, 2^74428247 is an apocalyptic number.

74428247 is a deficient number, since it is larger than the sum of its proper divisors (1).

74428247 is an equidigital number, since it uses as much as digits as its factorization.

74428247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 38.

The square root of 74428247 is about 8627.1807098264. The cubic root of 74428247 is about 420.6419642227.

The spelling of 74428247 in words is "seventy-four million, four hundred twenty-eight thousand, two hundred forty-seven".