28003641 has 8 divisors (see below), whose sum is σ = 39534624. Its totient is φ = 17570880.

The previous prime is 28003639. The next prime is 28003649. The reversal of 28003641 is 14630082.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28003641 - 2¹ = 28003639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28003649) 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, 274495 + ... + 274596.

It is an arithmetic number, because the mean of its divisors is an integer number (4941828).

Almost surely, 2^28003641 is an apocalyptic number.

It is an amenable number.

28003641 is a deficient number, since it is larger than the sum of its proper divisors (11530983).

28003641 is a wasteful number, since it uses less digits than its factorization.

28003641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549111.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 28003641 is about 5291.8466531070. The cubic root of 28003641 is about 303.6720587843.

It can be divided in two parts, 2800 and 3641, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 28003641 in words is "twenty-eight million, three thousand, six hundred forty-one".