28078073 has 8 divisors (see below), whose sum is σ = 28518600. Its totient is φ = 27641088.

The previous prime is 28078051. The next prime is 28078081. The reversal of 28078073 is 37087082.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8479744 + 19598329 = 2912^2 + 4427^2 .

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 28078073 - 2⁸ = 28077817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28078093) 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, 18113 + ... + 19601.

It is an arithmetic number, because the mean of its divisors is an integer number (3564825).

Almost surely, 2^28078073 is an apocalyptic number.

It is an amenable number.

28078073 is a deficient number, since it is larger than the sum of its proper divisors (440527).

28078073 is a wasteful number, since it uses less digits than its factorization.

28078073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1771.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 28078073 is about 5298.8746918568. The cubic root of 28078073 is about 303.9408681445.

Subtracting 28078073 from its reverse (37087082), we obtain a palindrome (9009009).

The spelling of 28078073 in words is "twenty-eight million, seventy-eight thousand, seventy-three".