28031398 has 8 divisors (see below), whose sum is σ = 42086520. Its totient is φ = 14002560.

The previous prime is 28031389. The next prime is 28031401. The reversal of 28031398 is 89313082.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3643 + ... + 8326.

It is an arithmetic number, because the mean of its divisors is an integer number (5260815).

Almost surely, 2^28031398 is an apocalyptic number.

28031398 is a deficient number, since it is larger than the sum of its proper divisors (14055122).

28031398 is a wasteful number, since it uses less digits than its factorization.

28031398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13142.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 28031398 is about 5294.4686230065. The cubic root of 28031398 is about 303.7723581458.

The spelling of 28031398 in words is "twenty-eight million, thirty-one thousand, three hundred ninety-eight".