71729866 has 8 divisors (see below), whose sum is σ = 115871364. Its totient is φ = 33106080.

The previous prime is 71729843. The next prime is 71729881. The reversal of 71729866 is 66892717.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 63441225 + 8288641 = 7965^2 + 2879^2 .

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, 1379395 + ... + 1379446.

Almost surely, 2^71729866 is an apocalyptic number.

71729866 is a deficient number, since it is larger than the sum of its proper divisors (44141498).

71729866 is a wasteful number, since it uses less digits than its factorization.

71729866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2758856.

The product of its digits is 254016, while the sum is 46.

The square root of 71729866 is about 8469.3486172196. The cubic root of 71729866 is about 415.4958335389.

The spelling of 71729866 in words is "seventy-one million, seven hundred twenty-nine thousand, eight hundred sixty-six".