28378197485 has 8 divisors (see below), whose sum is σ = 37149640416. Its totient is φ = 20638689040.

The previous prime is 28378197469. The next prime is 28378197499. The reversal of 28378197485 is 58479187382.

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

It is not a de Polignac number, because 28378197485 - 2⁴ = 28378197469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257983559 + ... + 257983668.

It is an arithmetic number, because the mean of its divisors is an integer number (4643705052).

Almost surely, 2^28378197485 is an apocalyptic number.

It is an amenable number.

28378197485 is a deficient number, since it is larger than the sum of its proper divisors (8771442931).

28378197485 is a wasteful number, since it uses less digits than its factorization.

28378197485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515967243.

The product of its digits is 27095040, while the sum is 62.

The spelling of 28378197485 in words is "twenty-eight billion, three hundred seventy-eight million, one hundred ninety-seven thousand, four hundred eighty-five".