28002141 has 6 divisors (see below), whose sum is σ = 40447550. Its totient is φ = 18668088.

The previous prime is 28002137. The next prime is 28002151. The reversal of 28002141 is 14120082.

It can be written as a sum of positive squares in only one way, i.e., 27092025 + 910116 = 5205^2 + 954^2 .

It is not a de Polignac number, because 28002141 - 2² = 28002137 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 (28002101) 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, 1555666 + ... + 1555683.

Almost surely, 2^28002141 is an apocalyptic number.

It is an amenable number.

28002141 is a deficient number, since it is larger than the sum of its proper divisors (12445409).

28002141 is a wasteful number, since it uses less digits than its factorization.

28002141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3111355 (or 3111352 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 28002141 is about 5291.7049237462. The cubic root of 28002141 is about 303.6666366772. Note that the first 4 decimals are identical.

The spelling of 28002141 in words is "twenty-eight million, two thousand, one hundred forty-one".