28078764671 has 8 divisors (see below), whose sum is σ = 28368234288. Its totient is φ = 27789520000.

The previous prime is 28078764667. The next prime is 28078764683. The reversal of 28078764671 is 17646787082.

It is a happy number.

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 28078764671 - 2² = 28078764667 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 (28078764641) by changing a digit.

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, 200711 + ... + 310551.

It is an arithmetic number, because the mean of its divisors is an integer number (3546029286).

Almost surely, 2^28078764671 is an apocalyptic number.

28078764671 is a deficient number, since it is larger than the sum of its proper divisors (289469617).

28078764671 is a wasteful number, since it uses less digits than its factorization.

28078764671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112473.

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 28078764671 in words is "twenty-eight billion, seventy-eight million, seven hundred sixty-four thousand, six hundred seventy-one".