18670428 has 72 divisors (see below), whose sum is σ = 55223168. Its totient is φ = 5207328.

The previous prime is 18670427. The next prime is 18670439. The reversal of 18670428 is 82407681.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18670392 and 18670401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18670423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9975 + ... + 11697.

Almost surely, 2^18670428 is an apocalyptic number.

18670428 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 18670428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27611584).

18670428 is an abundant number, since it is smaller than the sum of its proper divisors (36552740).

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

18670428 is a wasteful number, since it uses less digits than its factorization.

18670428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1783 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 18670428 is about 4320.9290667633. The cubic root of 18670428 is about 265.2882966638.

The spelling of 18670428 in words is "eighteen million, six hundred seventy thousand, four hundred twenty-eight".