71664328 has 8 divisors (see below), whose sum is σ = 134370630. Its totient is φ = 35832160.

The previous prime is 71664323. The next prime is 71664349. The reversal of 71664328 is 82346617.

It can be written as a sum of positive squares in only one way, i.e., 58400164 + 13264164 = 7642^2 + 3642^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (71664323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4479013 + ... + 4479028.

Almost surely, 2^71664328 is an apocalyptic number.

It is an amenable number.

71664328 is a deficient number, since it is larger than the sum of its proper divisors (62706302).

71664328 is a wasteful number, since it uses less digits than its factorization.

71664328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8958047 (or 8958043 counting only the distinct ones).

The product of its digits is 48384, while the sum is 37.

The square root of 71664328 is about 8465.4786043082. The cubic root of 71664328 is about 415.3692518464.

The spelling of 71664328 in words is "seventy-one million, six hundred sixty-four thousand, three hundred twenty-eight".