28258386 has 64 divisors (see below), whose sum is σ = 65390976. Its totient is φ = 8064000.

The previous prime is 28258367. The next prime is 28258387. The reversal of 28258386 is 68385282.

It is not an unprimeable number, because it can be changed into a prime (28258387) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 133821 + ... + 134031.

It is an arithmetic number, because the mean of its divisors is an integer number (1021734).

Almost surely, 2^28258386 is an apocalyptic number.

28258386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 28258386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32695488).

28258386 is an abundant number, since it is smaller than the sum of its proper divisors (37132590).

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

28258386 is a wasteful number, since it uses less digits than its factorization.

28258386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 347.

The product of its digits is 184320, while the sum is 42.

The square root of 28258386 is about 5315.8617363509. The cubic root of 28258386 is about 304.5901006284.

It can be divided in two parts, 2825 and 8386, that added together give a palindrome (11211).

The spelling of 28258386 in words is "twenty-eight million, two hundred fifty-eight thousand, three hundred eighty-six".