28212039 has 6 divisors (see below), whose sum is σ = 40750736. Its totient is φ = 18808020.

The previous prime is 28212013. The next prime is 28212043. The reversal of 28212039 is 93021282.

It is a happy number.

It is not a de Polignac number, because 28212039 - 2¹⁷ = 28080967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1567327 + ... + 1567344.

Almost surely, 2^28212039 is an apocalyptic number.

28212039 is a deficient number, since it is larger than the sum of its proper divisors (12538697).

28212039 is a wasteful number, since it uses less digits than its factorization.

28212039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3134677 (or 3134674 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 28212039 is about 5311.5006354137. The cubic root of 28212039 is about 304.4234885864.

It can be divided in two parts, 282 and 12039, that added together give a palindrome (12321).

The spelling of 28212039 in words is "twenty-eight million, two hundred twelve thousand, thirty-nine".