28078766028 has 18 divisors (see below), whose sum is σ = 70976880884. Its totient is φ = 9359588664.

The previous prime is 28078766021. The next prime is 28078766039. The reversal of 28078766028 is 82066787082.

28078766028 is a `hidden beast` number, since 28 + 0 + 7 + 8 + 7 + 6 + 602 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-3 number, since 3×28078766028³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (28078766021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 389982826 + ... + 389982897.

Almost surely, 2^28078766028 is an apocalyptic number.

It is an amenable number.

28078766028 is an abundant number, since it is smaller than the sum of its proper divisors (42898114856).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28078766028 is a wasteful number, since it uses less digits than its factorization.

28078766028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779965733 (or 779965728 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 28078766028 in words is "twenty-eight billion, seventy-eight million, seven hundred sixty-six thousand, twenty-eight".