28686078 has 24 divisors (see below), whose sum is σ = 62273016. Its totient is φ = 9543600.

The previous prime is 28686071. The next prime is 28686107. The reversal of 28686078 is 87068682.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28686071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10693 + ... + 13103.

It is an arithmetic number, because the mean of its divisors is an integer number (2594709).

Almost surely, 2^28686078 is an apocalyptic number.

28686078 is an abundant number, since it is smaller than the sum of its proper divisors (33586938).

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

28686078 is a wasteful number, since it uses less digits than its factorization.

28686078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3080 (or 3077 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 28686078 is about 5355.9385732101. The cubic root of 28686078 is about 306.1190745092.

The spelling of 28686078 in words is "twenty-eight million, six hundred eighty-six thousand, seventy-eight".