28212028 has 12 divisors (see below), whose sum is σ = 53168920. Its totient is φ = 13020912.

The previous prime is 28212013. The next prime is 28212043. The reversal of 28212028 is 82021282.

It is an interprime number because it is at equal distance from previous prime (28212013) and next prime (28212043).

It is a junction number, because it is equal to n+sod(n) for n = 28211993 and 28212011.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 271218 + ... + 271321.

Almost surely, 2^28212028 is an apocalyptic number.

It is an amenable number.

28212028 is a deficient number, since it is larger than the sum of its proper divisors (24956892).

28212028 is a wasteful number, since it uses less digits than its factorization.

28212028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542556 (or 542554 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 28212028 is about 5311.4995999247. The cubic root of 28212028 is about 304.4234490211.

The spelling of 28212028 in words is "twenty-eight million, two hundred twelve thousand, twenty-eight".