28778707607 has 4 divisors (see below), whose sum is σ = 30992454360. Its totient is φ = 26564960856.

The previous prime is 28778707597. The next prime is 28778707609. The reversal of 28778707607 is 70670787782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28778707607 - 2⁶ = 28778707543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28778707609) 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 3 ways as a sum of consecutive naturals, for example, 1106873357 + ... + 1106873382.

It is an arithmetic number, because the mean of its divisors is an integer number (7748113590).

Almost surely, 2^28778707607 is an apocalyptic number.

28778707607 is a deficient number, since it is larger than the sum of its proper divisors (2213746753).

28778707607 is a wasteful number, since it uses less digits than its factorization.

28778707607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2213746752.

The product of its (nonzero) digits is 12907776, while the sum is 59.

The spelling of 28778707607 in words is "twenty-eight billion, seven hundred seventy-eight million, seven hundred seven thousand, six hundred seven".