28918458 has 48 divisors (see below), whose sum is σ = 65563680. Its totient is φ = 9552816.

The previous prime is 28918457. The next prime is 28918459. The reversal of 28918458 is 85481982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28918457) and next prime (28918459).

It is not an unprimeable number, because it can be changed into a prime (28918451) 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, 76113 + ... + 76491.

It is an arithmetic number, because the mean of its divisors is an integer number (1365910).

Almost surely, 2^28918458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28918458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32781840).

28918458 is an abundant number, since it is smaller than the sum of its proper divisors (36645222).

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

28918458 is a wasteful number, since it uses less digits than its factorization.

28918458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 541 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 28918458 is about 5377.5884929957. The cubic root of 28918458 is about 306.9434549453.

The spelling of 28918458 in words is "twenty-eight million, nine hundred eighteen thousand, four hundred fifty-eight".