28218430 has 16 divisors (see below), whose sum is σ = 50866704. Its totient is φ = 11271040.

The previous prime is 28218413. The next prime is 28218431. The reversal of 28218430 is 3481282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218431) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7209 + ... + 10411.

It is an arithmetic number, because the mean of its divisors is an integer number (3179169).

Almost surely, 2^28218430 is an apocalyptic number.

28218430 is a deficient number, since it is larger than the sum of its proper divisors (22648274).

28218430 is a wasteful number, since it uses less digits than its factorization.

28218430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4091.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28218430 is about 5312.1022204020. The cubic root of 28218430 is about 304.4464743246.

The spelling of 28218430 in words is "twenty-eight million, two hundred eighteen thousand, four hundred thirty".