28212548 has 48 divisors (see below), whose sum is σ = 61246080. Its totient is φ = 11073024.

The previous prime is 28212523. The next prime is 28212557. The reversal of 28212548 is 84521282.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64940 + ... + 65372.

It is an arithmetic number, because the mean of its divisors is an integer number (1275960).

Almost surely, 2^28212548 is an apocalyptic number.

28212548 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 28212548, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30623040).

28212548 is an abundant number, since it is smaller than the sum of its proper divisors (33033532).

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

28212548 is a wasteful number, since it uses less digits than its factorization.

28212548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636 (or 634 counting only the distinct ones).

The product of its digits is 10240, while the sum is 32.

The square root of 28212548 is about 5311.5485500935. The cubic root of 28212548 is about 304.4253193725.

The spelling of 28212548 in words is "twenty-eight million, two hundred twelve thousand, five hundred forty-eight".