28470643 has 4 divisors (see below), whose sum is σ = 28533400. Its totient is φ = 28407888.

The previous prime is 28470613. The next prime is 28470647. The reversal of 28470643 is 34607482.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28470643 - 2¹³ = 28462451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28470599 and 28470608.

It is not an unprimeable number, because it can be changed into a prime (28470647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30693 + ... + 31606.

It is an arithmetic number, because the mean of its divisors is an integer number (7133350).

Almost surely, 2^28470643 is an apocalyptic number.

28470643 is a deficient number, since it is larger than the sum of its proper divisors (62757).

28470643 is an equidigital number, since it uses as much as digits as its factorization.

28470643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62756.

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 28470643 is about 5335.7888826302. The cubic root of 28470643 is about 305.3508209009.

The spelling of 28470643 in words is "twenty-eight million, four hundred seventy thousand, six hundred forty-three".