71244271644 has 96 divisors (see below), whose sum is σ = 213494615040. Its totient is φ = 17972748288.

The previous prime is 71244271643. The next prime is 71244271691. The reversal of 71244271644 is 44617244217.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 71244271596 and 71244271605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71244271643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1393189 + ... + 1443420.

It is an arithmetic number, because the mean of its divisors is an integer number (2223902240).

Almost surely, 2^71244271644 is an apocalyptic number.

It is an amenable number.

71244271644 is an abundant number, since it is smaller than the sum of its proper divisors (142250343396).

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

71244271644 is a wasteful number, since it uses less digits than its factorization.

71244271644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2836659 (or 2836657 counting only the distinct ones).

The product of its digits is 301056, while the sum is 42.

The spelling of 71244271644 in words is "seventy-one billion, two hundred forty-four million, two hundred seventy-one thousand, six hundred forty-four".