28140002 has 30 divisors (see below), whose sum is σ = 47976795. Its totient is φ = 12378300.

The previous prime is 28139999. The next prime is 28140011. The reversal of 28140002 is 20004182.

It can be written as a sum of positive squares in only one way, i.e., 14070001 + 14070001 = 3751^2 + 3751^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=3751.

It is a Duffinian 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 in 14 ways as a sum of consecutive naturals, for example, 907727 + ... + 907757.

Almost surely, 2^28140002 is an apocalyptic number.

28140002 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28140002 is a deficient number, since it is larger than the sum of its proper divisors (19836793).

28140002 is an frugal number, since it uses more digits than its factorization.

28140002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

The square root of 28140002 is about 5304.7150724615. The cubic root of 28140002 is about 304.1641613938.

Multiplying 28140002 by its product of nonzero digits (128), we get a square (3601920256 = 60016²).

Adding to 28140002 its reverse (20004182), we get a palindrome (48144184).

The spelling of 28140002 in words is "twenty-eight million, one hundred forty thousand, two".