28102648 has 32 divisors (see below), whose sum is σ = 60766560. Its totient is φ = 11934720.

The previous prime is 28102643. The next prime is 28102661. The reversal of 28102648 is 84620182.

It is a super-2 number, since 2×28102648² = 1579517649223808, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28102643) 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, 4108 + ... + 8548.

It is an arithmetic number, because the mean of its divisors is an integer number (1898955).

Almost surely, 2^28102648 is an apocalyptic number.

28102648 is a gapful number since it is divisible by the number (28) 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 28102648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30383280).

28102648 is an abundant number, since it is smaller than the sum of its proper divisors (32663912).

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

28102648 is a wasteful number, since it uses less digits than its factorization.

28102648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4567 (or 4563 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 28102648 is about 5301.1930732619. The cubic root of 28102648 is about 304.0295158322.

The spelling of 28102648 in words is "twenty-eight million, one hundred two thousand, six hundred forty-eight".