28378391073 has 8 divisors (see below), whose sum is σ = 38551776768. Its totient is φ = 18561966384.

The previous prime is 28378391053. The next prime is 28378391077. The reversal of 28378391073 is 37019387382.

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

It is not a de Polignac number, because 28378391073 - 2¹⁸ = 28378128929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28378391077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89240065 + ... + 89240382.

It is an arithmetic number, because the mean of its divisors is an integer number (4818972096).

Almost surely, 2^28378391073 is an apocalyptic number.

It is an amenable number.

28378391073 is a deficient number, since it is larger than the sum of its proper divisors (10173385695).

28378391073 is a wasteful number, since it uses less digits than its factorization.

28378391073 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178480503.

The product of its (nonzero) digits is 1524096, while the sum is 51.

The spelling of 28378391073 in words is "twenty-eight billion, three hundred seventy-eight million, three hundred ninety-one thousand, seventy-three".