71639494 has 8 divisors (see below), whose sum is σ = 107666280. Its totient is φ = 35750736.

The previous prime is 71639489. The next prime is 71639507. The reversal of 71639494 is 49493617.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 71639494.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33199 + ... + 35290.

It is an arithmetic number, because the mean of its divisors is an integer number (13458285).

Almost surely, 2^71639494 is an apocalyptic number.

71639494 is a deficient number, since it is larger than the sum of its proper divisors (36026786).

71639494 is a wasteful number, since it uses less digits than its factorization.

71639494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69014.

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

The square root of 71639494 is about 8464.0116965893. The cubic root of 71639494 is about 415.3212666909.

The spelling of 71639494 in words is "seventy-one million, six hundred thirty-nine thousand, four hundred ninety-four".