28021006 has 16 divisors (see below), whose sum is σ = 45378144. Its totient is φ = 12900384.

The previous prime is 28021003. The next prime is 28021009. The reversal of 28021006 is 60012082.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28021003) and next prime (28021009).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28021001) 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, 11556 + ... + 13768.

It is an arithmetic number, because the mean of its divisors is an integer number (2836134).

Almost surely, 2^28021006 is an apocalyptic number.

28021006 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28021006 is a deficient number, since it is larger than the sum of its proper divisors (17357138).

28021006 is a wasteful number, since it uses less digits than its factorization.

28021006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715.

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 28021006 is about 5293.4871304274. The cubic root of 28021006 is about 303.7348146202.

Adding to 28021006 its reverse (60012082), we get a palindrome (88033088).

The spelling of 28021006 in words is "twenty-eight million, twenty-one thousand, six".