28421398 has 4 divisors (see below), whose sum is σ = 42632100. Its totient is φ = 14210698.

The previous prime is 28421383. The next prime is 28421411. The reversal of 28421398 is 89312482.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7105348 + ... + 7105351.

It is an arithmetic number, because the mean of its divisors is an integer number (10658025).

Almost surely, 2^28421398 is an apocalyptic number.

28421398 is a deficient number, since it is larger than the sum of its proper divisors (14210702).

28421398 is a wasteful number, since it uses less digits than its factorization.

28421398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14210701.

The product of its digits is 27648, while the sum is 37.

The square root of 28421398 is about 5331.1722913446. The cubic root of 28421398 is about 305.1746665931.

The spelling of 28421398 in words is "twenty-eight million, four hundred twenty-one thousand, three hundred ninety-eight".