18897678 has 32 divisors (see below), whose sum is σ = 42690720. Its totient is φ = 6194880.

The previous prime is 18897677. The next prime is 18897691. The reversal of 18897678 is 87679881.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18897673) 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, 426 + ... + 6162.

It is an arithmetic number, because the mean of its divisors is an integer number (1334085).

Almost surely, 2^18897678 is an apocalyptic number.

18897678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18897678, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21345360).

18897678 is an abundant number, since it is smaller than the sum of its proper divisors (23793042).

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

18897678 is a wasteful number, since it uses less digits than its factorization.

18897678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5809 (or 5803 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 18897678 is about 4347.1459602824. The cubic root of 18897678 is about 266.3602915411.

The spelling of 18897678 in words is "eighteen million, eight hundred ninety-seven thousand, six hundred seventy-eight".