28748226 has 32 divisors (see below), whose sum is σ = 62854848. Its totient is φ = 8712000.

The previous prime is 28748221. The next prime is 28748231. The reversal of 28748226 is 62284782.

It is an interprime number because it is at equal distance from previous prime (28748221) and next prime (28748231).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28748221) 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 15 ways as a sum of consecutive naturals, for example, 2476 + ... + 7976.

It is an arithmetic number, because the mean of its divisors is an integer number (1964214).

Almost surely, 2^28748226 is an apocalyptic number.

28748226 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 28748226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31427424).

28748226 is an abundant number, since it is smaller than the sum of its proper divisors (34106622).

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

28748226 is a wasteful number, since it uses less digits than its factorization.

28748226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5586.

The product of its digits is 86016, while the sum is 39.

The square root of 28748226 is about 5361.7372184769. The cubic root of 28748226 is about 306.3399826659.

The spelling of 28748226 in words is "twenty-eight million, seven hundred forty-eight thousand, two hundred twenty-six".