28442407 has 8 divisors (see below), whose sum is σ = 33554432. Its totient is φ = 23592600.

The previous prime is 28442399. The next prime is 28442413. The reversal of 28442407 is 70424482.

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 28442407 - 2³ = 28442399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28442497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65319 + ... + 65752.

It is an arithmetic number, because the mean of its divisors is an integer number (4194304).

Almost surely, 2^28442407 is an apocalyptic number.

28442407 is a deficient number, since it is larger than the sum of its proper divisors (5112025).

28442407 is a wasteful number, since it uses less digits than its factorization.

28442407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131109.

The product of its (nonzero) digits is 14336, while the sum is 31.

The square root of 28442407 is about 5333.1423194961. The cubic root of 28442407 is about 305.2498427620.

Adding to 28442407 its reverse (70424482), we get a palindrome (98866889).

The spelling of 28442407 in words is "twenty-eight million, four hundred forty-two thousand, four hundred seven".