18728049897 has 24 divisors (see below), whose sum is σ = 28233878400. Its totient is φ = 11939947008.

The previous prime is 18728049829. The next prime is 18728049919. The reversal of 18728049897 is 79894082781.

18728049897 is a `hidden beast` number, since 187 + 280 + 4 + 98 + 97 = 666.

It is not a de Polignac number, because 18728049897 - 2¹⁶ = 18727984361 is a prime.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18728049817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1558729 + ... + 1570697.

It is an arithmetic number, because the mean of its divisors is an integer number (1176411600).

Almost surely, 2^18728049897 is an apocalyptic number.

It is an amenable number.

18728049897 is a deficient number, since it is larger than the sum of its proper divisors (9505828503).

18728049897 is a wasteful number, since it uses less digits than its factorization.

18728049897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19557 (or 19554 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 18728049897 in words is "eighteen billion, seven hundred twenty-eight million, forty-nine thousand, eight hundred ninety-seven".