71099644 has 96 divisors (see below), whose sum is σ = 169150464. Its totient is φ = 25297920.

The previous prime is 71099641. The next prime is 71099687. The reversal of 71099644 is 44699017.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 71099597 and 71099606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71099641) 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, 193549 + ... + 193915.

It is an arithmetic number, because the mean of its divisors is an integer number (1761984).

Almost surely, 2^71099644 is an apocalyptic number.

71099644 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71099644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84575232).

71099644 is an abundant number, since it is smaller than the sum of its proper divisors (98050820).

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

71099644 is a wasteful number, since it uses less digits than its factorization.

71099644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443 (or 441 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 71099644 is about 8432.0604836540. The cubic root of 71099644 is about 414.2753969006.

The spelling of 71099644 in words is "seventy-one million, ninety-nine thousand, six hundred forty-four".