71430247 has 4 divisors (see below), whose sum is σ = 81634576. Its totient is φ = 61225920.

The previous prime is 71430221. The next prime is 71430257. The reversal of 71430247 is 74203417.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74203417 = 19 ⋅3905443.

It is not a de Polignac number, because 71430247 - 2⁷ = 71430119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71430217) 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, 5102154 + ... + 5102167.

It is an arithmetic number, because the mean of its divisors is an integer number (20408644).

Almost surely, 2^71430247 is an apocalyptic number.

71430247 is a deficient number, since it is larger than the sum of its proper divisors (10204329).

71430247 is a wasteful number, since it uses less digits than its factorization.

71430247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204328.

The product of its (nonzero) digits is 4704, while the sum is 28.

The square root of 71430247 is about 8451.6416748464. The cubic root of 71430247 is about 414.9165110029.

The spelling of 71430247 in words is "seventy-one million, four hundred thirty thousand, two hundred forty-seven".