28979839 has 8 divisors (see below), whose sum is σ = 34560000. Its totient is φ = 23759736.

The previous prime is 28979837. The next prime is 28979851. The reversal of 28979839 is 93897982.

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

It is not a de Polignac number, because 28979839 - 2¹ = 28979837 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28979839.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28979831) 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, 89839 + ... + 90160.

It is an arithmetic number, because the mean of its divisors is an integer number (4320000).

Almost surely, 2^28979839 is an apocalyptic number.

28979839 is a deficient number, since it is larger than the sum of its proper divisors (5580161).

28979839 is a wasteful number, since it uses less digits than its factorization.

28979839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180029.

The product of its digits is 1959552, while the sum is 55.

The square root of 28979839 is about 5383.2925798251. The cubic root of 28979839 is about 307.1604695353.

The spelling of 28979839 in words is "twenty-eight million, nine hundred seventy-nine thousand, eight hundred thirty-nine".