71668224 has 120 divisors (see below), whose sum is σ = 210230592. Its totient is φ = 23500800.

The previous prime is 71668189. The next prime is 71668231. The reversal of 71668224 is 42286617.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 474549 + ... + 474699.

Almost surely, 2^71668224 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71668224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105115296).

71668224 is an abundant number, since it is smaller than the sum of its proper divisors (138562368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71668224 is a wasteful number, since it uses less digits than its factorization.

71668224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278 (or 259 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 71668224 is about 8465.7087122107. The cubic root of 71668224 is about 415.3767788328.

The spelling of 71668224 in words is "seventy-one million, six hundred sixty-eight thousand, two hundred twenty-four".