28900213 has 4 divisors (see below), whose sum is σ = 30156768. Its totient is φ = 27643660.

The previous prime is 28900177. The next prime is 28900217. The reversal of 28900213 is 31200982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31200982 = 2 ⋅15600491.

It is a cyclic number.

It is not a de Polignac number, because 28900213 - 2¹⁷ = 28769141 is a prime.

It is a super-2 number, since 2×28900213² = 1670444622890738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28900217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 628243 + ... + 628288.

It is an arithmetic number, because the mean of its divisors is an integer number (7539192).

Almost surely, 2^28900213 is an apocalyptic number.

28900213 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28900213 is a deficient number, since it is larger than the sum of its proper divisors (1256555).

28900213 is a wasteful number, since it uses less digits than its factorization.

28900213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1256554.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 28900213 is about 5375.8918329892. The cubic root of 28900213 is about 306.8788899365.

The spelling of 28900213 in words is "twenty-eight million, nine hundred thousand, two hundred thirteen".