28532643 has 8 divisors (see below), whose sum is σ = 38136000. Its totient is φ = 18975528.

The previous prime is 28532641. The next prime is 28532653. The reversal of 28532643 is 34623582.

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 28532643 - 2¹ = 28532641 is a prime.

It is a super-2 number, since 2×28532643² = 1628223433130898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28532641) 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, 10093 + ... + 12606.

It is an arithmetic number, because the mean of its divisors is an integer number (4767000).

Almost surely, 2^28532643 is an apocalyptic number.

28532643 is a deficient number, since it is larger than the sum of its proper divisors (9603357).

28532643 is a wasteful number, since it uses less digits than its factorization.

28532643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23121.

The product of its digits is 34560, while the sum is 33.

The square root of 28532643 is about 5341.5955481485. The cubic root of 28532643 is about 305.5723125037.

The spelling of 28532643 in words is "twenty-eight million, five hundred thirty-two thousand, six hundred forty-three".