71218645 has 8 divisors (see below), whose sum is σ = 85516704. Its totient is φ = 56938704.

The previous prime is 71218597. The next prime is 71218657. The reversal of 71218645 is 54681217.

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

It is a cyclic number.

It is not a de Polignac number, because 71218645 - 2¹¹ = 71216597 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71218645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6622 + ... + 13648.

It is an arithmetic number, because the mean of its divisors is an integer number (10689588).

Almost surely, 2^71218645 is an apocalyptic number.

It is an amenable number.

71218645 is a deficient number, since it is larger than the sum of its proper divisors (14298059).

71218645 is a wasteful number, since it uses less digits than its factorization.

71218645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9059.

The product of its digits is 13440, while the sum is 34.

The square root of 71218645 is about 8439.1139937792. The cubic root of 71218645 is about 414.5063952803.

It can be divided in two parts, 7 and 1218645, that multiplied together give a triangular number (8530515 = T₄₁₃₀).

The spelling of 71218645 in words is "seventy-one million, two hundred eighteen thousand, six hundred forty-five".