28067778 has 24 divisors (see below), whose sum is σ = 61549488. Its totient is φ = 9242712.

The previous prime is 28067759. The next prime is 28067783. The reversal of 28067778 is 87776082.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7900 + ... + 10887.

It is an arithmetic number, because the mean of its divisors is an integer number (2564562).

Almost surely, 2^28067778 is an apocalyptic number.

28067778 is an abundant number, since it is smaller than the sum of its proper divisors (33481710).

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

28067778 is a wasteful number, since it uses less digits than its factorization.

28067778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18878 (or 18875 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 45.

The square root of 28067778 is about 5297.9031701231. The cubic root of 28067778 is about 303.9037163340.

The spelling of 28067778 in words is "twenty-eight million, sixty-seven thousand, seven hundred seventy-eight".