28239406 has 32 divisors (see below), whose sum is σ = 47628000. Its totient is φ = 12472320.

The previous prime is 28239391. The next prime is 28239413. The reversal of 28239406 is 60493282.

It is a super-3 number, since 3×28239406³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62670 + ... + 63118.

It is an arithmetic number, because the mean of its divisors is an integer number (1488375).

Almost surely, 2^28239406 is an apocalyptic number.

28239406 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28239406 is a deficient number, since it is larger than the sum of its proper divisors (19388594).

28239406 is a wasteful number, since it uses less digits than its factorization.

28239406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564.

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28239406 is about 5314.0762132284. The cubic root of 28239406 is about 304.5218917917.

The spelling of 28239406 in words is "twenty-eight million, two hundred thirty-nine thousand, four hundred six".