28445407 has 8 divisors (see below), whose sum is σ = 28854176. Its totient is φ = 28039392.

The previous prime is 28445401. The next prime is 28445429. The reversal of 28445407 is 70454482.

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 28445407 - 2⁷ = 28445279 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 (28445401) 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, 28033 + ... + 29029.

It is an arithmetic number, because the mean of its divisors is an integer number (3606772).

Almost surely, 2^28445407 is an apocalyptic number.

28445407 is a deficient number, since it is larger than the sum of its proper divisors (408769).

28445407 is a wasteful number, since it uses less digits than its factorization.

28445407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377.

The product of its (nonzero) digits is 35840, while the sum is 34.

The square root of 28445407 is about 5333.4235721533. The cubic root of 28445407 is about 305.2605745933.

Adding to 28445407 its reverse (70454482), we get a palindrome (98899889).

The spelling of 28445407 in words is "twenty-eight million, four hundred forty-five thousand, four hundred seven".