28348931 has 8 divisors (see below), whose sum is σ = 32136720. Its totient is φ = 24790752.

The previous prime is 28348909. The next prime is 28348933. The reversal of 28348931 is 13984382.

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

It is a cyclic number.

It is not a de Polignac number, because 28348931 - 2¹⁴ = 28332547 is a prime.

It is a super-2 number, since 2×28348931² = 1607323777685522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28348933) 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, 57140 + ... + 57633.

It is an arithmetic number, because the mean of its divisors is an integer number (4017090).

Almost surely, 2^28348931 is an apocalyptic number.

28348931 is a deficient number, since it is larger than the sum of its proper divisors (3787789).

28348931 is a wasteful number, since it uses less digits than its factorization.

28348931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114805.

The product of its digits is 41472, while the sum is 38.

The square root of 28348931 is about 5324.3714182991. The cubic root of 28348931 is about 304.9150744471.

The spelling of 28348931 in words is "twenty-eight million, three hundred forty-eight thousand, nine hundred thirty-one".