71639744 has 84 divisors (see below), whose sum is σ = 161943288. Its totient is φ = 31440640.

The previous prime is 71639731. The next prime is 71639759. The reversal of 71639744 is 44793617.

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.

Its product of digits (127008) is a multiple of the sum of its prime divisors (42).

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, 2470322 + ... + 2470350.

Almost surely, 2^71639744 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 71639744, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80971644).

71639744 is an abundant number, since it is smaller than the sum of its proper divisors (90303544).

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

71639744 is an equidigital number, since it uses as much as digits as its factorization.

71639744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 42 counting only the distinct ones).

The product of its digits is 127008, while the sum is 41.

The square root of 71639744 is about 8464.0264649870. The cubic root of 71639744 is about 415.3217498053.

The spelling of 71639744 in words is "seventy-one million, six hundred thirty-nine thousand, seven hundred forty-four".