28978986 has 16 divisors (see below), whose sum is σ = 59827968. Its totient is φ = 9348000.

The previous prime is 28978981. The next prime is 28978991. The reversal of 28978986 is 68987982.

It is an interprime number because it is at equal distance from previous prime (28978981) and next prime (28978991).

It is not an unprimeable number, because it can be changed into a prime (28978981) 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, 77715 + ... + 78086.

It is an arithmetic number, because the mean of its divisors is an integer number (3739248).

Almost surely, 2^28978986 is an apocalyptic number.

28978986 is an abundant number, since it is smaller than the sum of its proper divisors (30848982).

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

28978986 is a wasteful number, since it uses less digits than its factorization.

28978986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155837.

The product of its digits is 3483648, while the sum is 57.

The square root of 28978986 is about 5383.2133526361. The cubic root of 28978986 is about 307.1574558257.

The spelling of 28978986 in words is "twenty-eight million, nine hundred seventy-eight thousand, nine hundred eighty-six".