28438879 has 16 divisors (see below), whose sum is σ = 35089920. Its totient is φ = 22508640.

The previous prime is 28438853. The next prime is 28438889. The reversal of 28438879 is 97883482.

It is not a de Polignac number, because 28438879 - 2⁵ = 28438847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1624 + ... + 7714.

It is an arithmetic number, because the mean of its divisors is an integer number (2193120).

Almost surely, 2^28438879 is an apocalyptic number.

28438879 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

28438879 is a deficient number, since it is larger than the sum of its proper divisors (6651041).

28438879 is a wasteful number, since it uses less digits than its factorization.

28438879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6150.

The product of its digits is 774144, while the sum is 49.

The square root of 28438879 is about 5332.8115473922. The cubic root of 28438879 is about 305.2372211630.

The spelling of 28438879 in words is "twenty-eight million, four hundred thirty-eight thousand, eight hundred seventy-nine".