28444907 has 4 divisors (see below), whose sum is σ = 28491480. Its totient is φ = 28398336.

The previous prime is 28444883. The next prime is 28444909. The reversal of 28444907 is 70944482.

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 28444907 - 2¹⁴ = 28428523 is a prime.

It is a super-2 number, since 2×28444907² = 1618225468477298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28444909) 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, 22358 + ... + 23595.

It is an arithmetic number, because the mean of its divisors is an integer number (7122870).

Almost surely, 2^28444907 is an apocalyptic number.

28444907 is a deficient number, since it is larger than the sum of its proper divisors (46573).

28444907 is an equidigital number, since it uses as much as digits as its factorization.

28444907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46572.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 28444907 is about 5333.3766977404. The cubic root of 28444907 is about 305.2587860071.

The spelling of 28444907 in words is "twenty-eight million, four hundred forty-four thousand, nine hundred seven".