71664392 has 36 divisors (see below), whose sum is σ = 139640535. Its totient is φ = 34479360.

The previous prime is 71664391. The next prime is 71664403. The reversal of 71664392 is 29346617.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 5 ways, for example, as 5827396 + 65836996 = 2414^2 + 8114^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5986.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71664391) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 981668 + ... + 981740.

Almost surely, 2^71664392 is an apocalyptic number.

It is an amenable number.

71664392 is a deficient number, since it is larger than the sum of its proper divisors (67976143).

71664392 is an equidigital number, since it uses as much as digits as its factorization.

71664392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234 (or 116 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 71664392 is about 8465.4823843653. The cubic root of 71664392 is about 415.3693754952.

The spelling of 71664392 in words is "seventy-one million, six hundred sixty-four thousand, three hundred ninety-two".