74649247 has 4 divisors (see below), whose sum is σ = 76385320. Its totient is φ = 72913176.

The previous prime is 74649229. The next prime is 74649251. The reversal of 74649247 is 74294647.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74294647 = 7 ⋅10613521.

It is a cyclic number.

It is not a de Polignac number, because 74649247 - 2¹⁹ = 74124959 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1736029 = 74649247 / (7 + 4 + 6 + 4 + 9 + 2 + 4 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74649217) 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, 867972 + ... + 868057.

It is an arithmetic number, because the mean of its divisors is an integer number (19096330).

Almost surely, 2^74649247 is an apocalyptic number.

74649247 is a deficient number, since it is larger than the sum of its proper divisors (1736073).

74649247 is a wasteful number, since it uses less digits than its factorization.

74649247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1736072.

The product of its digits is 338688, while the sum is 43.

The square root of 74649247 is about 8639.9795717351. The cubic root of 74649247 is about 421.0578906067.

The spelling of 74649247 in words is "seventy-four million, six hundred forty-nine thousand, two hundred forty-seven".