28421667 has 18 divisors (see below), whose sum is σ = 42163836. Its totient is φ = 18438840.

The previous prime is 28421639. The next prime is 28421681. The reversal of 28421667 is 76612482.

It is not a de Polignac number, because 28421667 - 2⁸ = 28421411 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28421167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 104742 + ... + 105012.

Almost surely, 2^28421667 is an apocalyptic number.

28421667 is a deficient number, since it is larger than the sum of its proper divisors (13742169).

28421667 is an equidigital number, since it uses as much as digits as its factorization.

28421667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 591 (or 317 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28421667 is about 5331.1975202575. The cubic root of 28421667 is about 305.1756293856.

The spelling of 28421667 in words is "twenty-eight million, four hundred twenty-one thousand, six hundred sixty-seven".