28078561786 has 16 divisors (see below), whose sum is σ = 45951027840. Its totient is φ = 12761790880.

The previous prime is 28078561781. The next prime is 28078561789. The reversal of 28078561786 is 68716587082.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28078561786.

It is not an unprimeable number, because it can be changed into a prime (28078561781) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208095 + ... + 315373.

It is an arithmetic number, because the mean of its divisors is an integer number (2871939240).

Almost surely, 2^28078561786 is an apocalyptic number.

28078561786 is a deficient number, since it is larger than the sum of its proper divisors (17872466054).

28078561786 is a wasteful number, since it uses less digits than its factorization.

28078561786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119189.

The product of its (nonzero) digits is 9031680, while the sum is 58.

The spelling of 28078561786 in words is "twenty-eight billion, seventy-eight million, five hundred sixty-one thousand, seven hundred eighty-six".