71684890 has 8 divisors (see below), whose sum is σ = 129032820. Its totient is φ = 28673952.

The previous prime is 71684881. The next prime is 71684923. The reversal of 71684890 is 9848617.

It can be written as a sum of positive squares in 2 ways, for example, as 62678889 + 9006001 = 7917^2 + 3001^2 .

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

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, 3584235 + ... + 3584254.

Almost surely, 2^71684890 is an apocalyptic number.

71684890 is a deficient number, since it is larger than the sum of its proper divisors (57347930).

71684890 is a wasteful number, since it uses less digits than its factorization.

71684890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7168496.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 71684890 is about 8466.6929789617. The cubic root of 71684890 is about 415.4089741000.

The spelling of 71684890 in words is "seventy-one million, six hundred eighty-four thousand, eight hundred ninety".