28005052778 has 8 divisors (see below), whose sum is σ = 42008561280. Its totient is φ = 14002199020.

The previous prime is 28005052763. The next prime is 28005052813. The reversal of 28005052778 is 87725050082.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 37208 + ... + 239571.

It is an arithmetic number, because the mean of its divisors is an integer number (5251070160).

Almost surely, 2^28005052778 is an apocalyptic number.

28005052778 is a deficient number, since it is larger than the sum of its proper divisors (14003508502).

28005052778 is a wasteful number, since it uses less digits than its factorization.

28005052778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327372.

The product of its (nonzero) digits is 313600, while the sum is 44.

The spelling of 28005052778 in words is "twenty-eight billion, five million, fifty-two thousand, seven hundred seventy-eight".