28442907 has 24 divisors (see below), whose sum is σ = 43266496. Its totient is φ = 18668232.

The previous prime is 28442893. The next prime is 28442929. The reversal of 28442907 is 70924482.

It is not a de Polignac number, because 28442907 - 2¹⁴ = 28426523 is a prime.

It is a super-2 number, since 2×28442907² = 1617997917221298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28442957) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15408 + ... + 17154.

Almost surely, 2^28442907 is an apocalyptic number.

28442907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28442907 is a deficient number, since it is larger than the sum of its proper divisors (14823589).

28442907 is an equidigital number, since it uses as much as digits as its factorization.

28442907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1829 (or 1817 counting only the distinct ones).

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

The square root of 28442907 is about 5333.1891959690. The cubic root of 28442907 is about 305.2516314530.

The spelling of 28442907 in words is "twenty-eight million, four hundred forty-two thousand, nine hundred seven".