28438998 has 16 divisors (see below), whose sum is σ = 65003520. Its totient is φ = 8125416.

The previous prime is 28438987. The next prime is 28438999. The reversal of 28438998 is 89983482.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28438998.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28438999) 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, 338518 + ... + 338601.

It is an arithmetic number, because the mean of its divisors is an integer number (4062720).

Almost surely, 2^28438998 is an apocalyptic number.

28438998 is an abundant number, since it is smaller than the sum of its proper divisors (36564522).

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

28438998 is a wasteful number, since it uses less digits than its factorization.

28438998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677131.

The product of its digits is 995328, while the sum is 51.

The square root of 28438998 is about 5332.8227047221. The cubic root of 28438998 is about 305.2376469085.

The spelling of 28438998 in words is "twenty-eight million, four hundred thirty-eight thousand, nine hundred ninety-eight".