71393544 has 72 divisors (see below), whose sum is σ = 197632890. Its totient is φ = 23282688.

The previous prime is 71393537. The next prime is 71393551. The reversal of 71393544 is 44539317.

It is an interprime number because it is at equal distance from previous prime (71393537) and next prime (71393551).

It can be written as a sum of positive squares in 3 ways, for example, as 68260644 + 3132900 = 8262^2 + 1770^2 .

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 = 71393499 and 71393508.

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 17 ways as a sum of consecutive naturals, for example, 202072 + ... + 202424.

Almost surely, 2^71393544 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 71393544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98816445).

71393544 is an abundant number, since it is smaller than the sum of its proper divisors (126239346).

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

71393544 is a wasteful number, since it uses less digits than its factorization.

71393544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 471 (or 411 counting only the distinct ones).

The product of its digits is 45360, while the sum is 36.

The square root of 71393544 is about 8449.4700425530. The cubic root of 71393544 is about 414.8454333180.

The spelling of 71393544 in words is "seventy-one million, three hundred ninety-three thousand, five hundred forty-four".