71744544 has 72 divisors (see below), whose sum is σ = 212913792. Its totient is φ = 22872960.

The previous prime is 71744507. The next prime is 71744557. The reversal of 71744544 is 44544717.

It is a happy number.

71744544 is a `hidden beast` number, since 71 + 7 + 44 + 544 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

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

It is a junction number, because it is equal to n+sod(n) for n = 71744499 and 71744508.

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, 1209 + ... + 12039.

It is an arithmetic number, because the mean of its divisors is an integer number (2957136).

Almost surely, 2^71744544 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 71744544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106456896).

71744544 is an abundant number, since it is smaller than the sum of its proper divisors (141169248).

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

71744544 is a wasteful number, since it uses less digits than its factorization.

71744544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10870 (or 10859 counting only the distinct ones).

The product of its digits is 62720, while the sum is 36.

The square root of 71744544 is about 8470.2151094290. The cubic root of 71744544 is about 415.5241724176.

The spelling of 71744544 in words is "seventy-one million, seven hundred forty-four thousand, five hundred forty-four".