28388886 has 8 divisors (see below), whose sum is σ = 56777784. Its totient is φ = 9462960.

The previous prime is 28388881. The next prime is 28388909. The reversal of 28388886 is 68888382.

It is a sphenic number, since it is the product of 3 distinct primes.

28388886 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28388881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2365735 + ... + 2365746.

It is an arithmetic number, because the mean of its divisors is an integer number (7097223).

Almost surely, 2^28388886 is an apocalyptic number.

28388886 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28388886 is a wasteful number, since it uses less digits than its factorization.

28388886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4731486.

The product of its digits is 1179648, while the sum is 51.

The square root of 28388886 is about 5328.1221832837. The cubic root of 28388886 is about 305.0582563629.

The spelling of 28388886 in words is "twenty-eight million, three hundred eighty-eight thousand, eight hundred eighty-six".