71720064 has 96 divisors (see below), whose sum is σ = 222303900. Its totient is φ = 22063104.

The previous prime is 71720057. The next prime is 71720101. The reversal of 71720064 is 46002717.

It can be written as a sum of positive squares in 2 ways, for example, as 57881664 + 13838400 = 7608^2 + 3720^2 .

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12582 + ... + 17370.

Almost surely, 2^71720064 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 71720064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111151950).

71720064 is an abundant number, since it is smaller than the sum of its proper divisors (150583836).

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

71720064 is a wasteful number, since it uses less digits than its factorization.

71720064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4822 (or 4807 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 71720064 is about 8468.7699224858. The cubic root of 71720064 is about 415.4769066218.

The spelling of 71720064 in words is "seventy-one million, seven hundred twenty thousand, sixty-four".