117821644 has 24 divisors (see below), whose sum is σ = 210858480. Its totient is φ = 57590016.

The previous prime is 117821629. The next prime is 117821647. The reversal of 117821644 is 446128711.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (117821647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35112 + ... + 38320.

It is an arithmetic number, because the mean of its divisors is an integer number (8785770).

Almost surely, 2^117821644 is an apocalyptic number.

It is an amenable number.

117821644 is a deficient number, since it is larger than the sum of its proper divisors (93036836).

117821644 is a wasteful number, since it uses less digits than its factorization.

117821644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417 (or 3415 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 117821644 is about 10854.5678863785. The cubic root of 117821644 is about 490.2395663196.

It can be divided in two parts, 1178 and 21644, that added together give a palindrome (22822).

The spelling of 117821644 in words is "one hundred seventeen million, eight hundred twenty-one thousand, six hundred forty-four".