71964661 has 8 divisors (see below), whose sum is σ = 73624320. Its totient is φ = 70310448.

The previous prime is 71964649. The next prime is 71964703. The reversal of 71964661 is 16646917.

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 71964661 - 2²³ = 63576053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71964161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38040 + ... + 39886.

It is an arithmetic number, because the mean of its divisors is an integer number (9203040).

Almost surely, 2^71964661 is an apocalyptic number.

It is an amenable number.

71964661 is a deficient number, since it is larger than the sum of its proper divisors (1659659).

71964661 is a wasteful number, since it uses less digits than its factorization.

71964661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2723.

The product of its digits is 54432, while the sum is 40.

The square root of 71964661 is about 8483.1987481138. The cubic root of 71964661 is about 415.9486904327.

The spelling of 71964661 in words is "seventy-one million, nine hundred sixty-four thousand, six hundred sixty-one".