28420671 has 4 divisors (see below), whose sum is σ = 37894232. Its totient is φ = 18947112.

The previous prime is 28420669. The next prime is 28420673. The reversal of 28420671 is 17602482.

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

It is an interprime number because it is at equal distance from previous prime (28420669) and next prime (28420673).

It is not a de Polignac number, because 28420671 - 2¹ = 28420669 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 (28420673) 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, 4736776 + ... + 4736781.

It is an arithmetic number, because the mean of its divisors is an integer number (9473558).

Almost surely, 2^28420671 is an apocalyptic number.

28420671 is a deficient number, since it is larger than the sum of its proper divisors (9473561).

28420671 is an equidigital number, since it uses as much as digits as its factorization.

28420671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473560.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28420671 is about 5331.1041070307. The cubic root of 28420671 is about 305.1720645175.

The spelling of 28420671 in words is "twenty-eight million, four hundred twenty thousand, six hundred seventy-one".