28002681 has 12 divisors (see below), whose sum is σ = 46226752. Its totient is φ = 16001496.

The previous prime is 28002671. The next prime is 28002743. The reversal of 28002681 is 18620082.

It is not a de Polignac number, because 28002681 - 2⁶ = 28002617 is a prime.

It is a super-2 number, since 2×28002681² = 1568300286375522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28002671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 222181 + ... + 222306.

Almost surely, 2^28002681 is an apocalyptic number.

28002681 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28002681 is a deficient number, since it is larger than the sum of its proper divisors (18224071).

28002681 is a wasteful number, since it uses less digits than its factorization.

28002681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444500 (or 444497 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28002681 is about 5291.7559467534. The cubic root of 28002681 is about 303.6685886581.

The spelling of 28002681 in words is "twenty-eight million, two thousand, six hundred eighty-one".