28440907 has 8 divisors (see below), whose sum is σ = 31087152. Its totient is φ = 25804800.

The previous prime is 28440899. The next prime is 28440917. The reversal of 28440907 is 70904482.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28440907 - 2³ = 28440899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28440917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4107 + ... + 8587.

It is an arithmetic number, because the mean of its divisors is an integer number (3885894).

Almost surely, 2^28440907 is an apocalyptic number.

28440907 is a deficient number, since it is larger than the sum of its proper divisors (2646245).

28440907 is a wasteful number, since it uses less digits than its factorization.

28440907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5069.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28440907 is about 5333.0016876052. The cubic root of 28440907 is about 305.2444765635.

The spelling of 28440907 in words is "twenty-eight million, four hundred forty thousand, nine hundred seven".