71436644 has 6 divisors (see below), whose sum is σ = 125014134. Its totient is φ = 35718320.

The previous prime is 71436641. The next prime is 71436647. The reversal of 71436644 is 44663417.

It is an interprime number because it is at equal distance from previous prime (71436641) and next prime (71436647).

It can be written as a sum of positive squares in only one way, i.e., 59876644 + 11560000 = 7738^2 + 3400^2 .

It is a super-3 number, since 3×71436644³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (71436641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8929577 + ... + 8929584.

It is an arithmetic number, because the mean of its divisors is an integer number (20835689).

Almost surely, 2^71436644 is an apocalyptic number.

It is an amenable number.

71436644 is a deficient number, since it is larger than the sum of its proper divisors (53577490).

71436644 is a wasteful number, since it uses less digits than its factorization.

71436644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17859165 (or 17859163 counting only the distinct ones).

The product of its digits is 48384, while the sum is 35.

The square root of 71436644 is about 8452.0201135587. The cubic root of 71436644 is about 414.9288967069.

The spelling of 71436644 in words is "seventy-one million, four hundred thirty-six thousand, six hundred forty-four".