71493447 has 16 divisors (see below), whose sum is σ = 100568960. Its totient is φ = 45051552.

The previous prime is 71493437. The next prime is 71493469. The reversal of 71493447 is 74439417.

It is not a de Polignac number, because 71493447 - 2⁴ = 71493431 is a prime.

It is a super-2 number, since 2×71493447² = 10222625927883618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71493437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30033 + ... + 32325.

It is an arithmetic number, because the mean of its divisors is an integer number (6285560).

Almost surely, 2^71493447 is an apocalyptic number.

71493447 is a deficient number, since it is larger than the sum of its proper divisors (29075513).

71493447 is a wasteful number, since it uses less digits than its factorization.

71493447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2862.

The product of its digits is 84672, while the sum is 39.

The square root of 71493447 is about 8455.3797667521. The cubic root of 71493447 is about 415.0388447696.

The spelling of 71493447 in words is "seventy-one million, four hundred ninety-three thousand, four hundred forty-seven".