18641768 has 8 divisors (see below), whose sum is σ = 34953330. Its totient is φ = 9320880.

The previous prime is 18641767. The next prime is 18641789. The reversal of 18641768 is 86714681.

It can be written as a sum of positive squares in only one way, i.e., 11682724 + 6959044 = 3418^2 + 2638^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (18641767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1165103 + ... + 1165118.

Almost surely, 2^18641768 is an apocalyptic number.

It is an amenable number.

18641768 is a deficient number, since it is larger than the sum of its proper divisors (16311562).

18641768 is a wasteful number, since it uses less digits than its factorization.

18641768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2330227 (or 2330223 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 18641768 is about 4317.6113766758. The cubic root of 18641768 is about 265.1524837388.

The spelling of 18641768 in words is "eighteen million, six hundred forty-one thousand, seven hundred sixty-eight".