28839886 has 8 divisors (see below), whose sum is σ = 43284240. Its totient is φ = 14411808.

The previous prime is 28839883. The next prime is 28839893. The reversal of 28839886 is 68893882.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28839883) 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, 2455 + ... + 7981.

It is an arithmetic number, because the mean of its divisors is an integer number (5410530).

Almost surely, 2^28839886 is an apocalyptic number.

28839886 is a deficient number, since it is larger than the sum of its proper divisors (14444354).

28839886 is a wasteful number, since it uses less digits than its factorization.

28839886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8138.

The product of its digits is 1327104, while the sum is 52.

The square root of 28839886 is about 5370.2780188739. The cubic root of 28839886 is about 306.6652123960.

It can be divided in two parts, 2883 and 9886, that added together give a square (12769 = 113²).

The spelling of 28839886 in words is "twenty-eight million, eight hundred thirty-nine thousand, eight hundred eighty-six".