18877428 has 48 divisors (see below), whose sum is σ = 49445760. Its totient is φ = 6227712.

The previous prime is 18877423. The next prime is 18877447. The reversal of 18877428 is 82477881.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18877423) 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, 10276 + ... + 11972.

It is an arithmetic number, because the mean of its divisors is an integer number (1030120).

Almost surely, 2^18877428 is an apocalyptic number.

18877428 is a gapful number since it is divisible by the number (18) 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 18877428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24722880).

18877428 is an abundant number, since it is smaller than the sum of its proper divisors (30568332).

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

18877428 is a wasteful number, since it uses less digits than its factorization.

18877428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1813 (or 1805 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 18877428 is about 4344.8162216600. The cubic root of 18877428 is about 266.2651171738.

The spelling of 18877428 in words is "eighteen million, eight hundred seventy-seven thousand, four hundred twenty-eight".