194081664 has 128 divisors (see below), whose sum is σ = 595745280. Its totient is φ = 54835200.

The previous prime is 194081663. The next prime is 194081689. The reversal of 194081664 is 466180491.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194081663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 276514 + ... + 277214.

It is an arithmetic number, because the mean of its divisors is an integer number (4654260).

Almost surely, 2^194081664 is an apocalyptic number.

194081664 is a gapful number since it is divisible by the number (14) 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 194081664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297872640).

194081664 is an abundant number, since it is smaller than the sum of its proper divisors (401663616).

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

194081664 is a wasteful number, since it uses less digits than its factorization.

194081664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 816 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 194081664 is about 13931.3195354927. The cubic root of 194081664 is about 578.9772542751.

The spelling of 194081664 in words is "one hundred ninety-four million, eighty-one thousand, six hundred sixty-four".