71493649 has 4 divisors (see below), whose sum is σ = 73156336. Its totient is φ = 69830964.

The previous prime is 71493629. The next prime is 71493659. The reversal of 71493649 is 94639417.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71493649 - 2¹³ = 71485457 is a prime.

It is a super-3 number, since 3×71493649³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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: 1662643 = 71493649 / (7 + 1 + 4 + 9 + 3 + 6 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71493629) 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, 831279 + ... + 831364.

It is an arithmetic number, because the mean of its divisors is an integer number (18289084).

Almost surely, 2^71493649 is an apocalyptic number.

It is an amenable number.

71493649 is a deficient number, since it is larger than the sum of its proper divisors (1662687).

71493649 is a wasteful number, since it uses less digits than its factorization.

71493649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1662686.

The product of its digits is 163296, while the sum is 43.

The square root of 71493649 is about 8455.3917118014. The cubic root of 71493649 is about 415.0392356575.

The spelling of 71493649 in words is "seventy-one million, four hundred ninety-three thousand, six hundred forty-nine".