28403402 has 16 divisors (see below), whose sum is σ = 43225152. Its totient is φ = 13996800.

The previous prime is 28403393. The next prime is 28403429. The reversal of 28403402 is 20430482.

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 7 ways as a sum of consecutive naturals, for example, 48938 + ... + 49514.

It is an arithmetic number, because the mean of its divisors is an integer number (2701572).

Almost surely, 2^28403402 is an apocalyptic number.

28403402 is a deficient number, since it is larger than the sum of its proper divisors (14821750).

28403402 is a wasteful number, since it uses less digits than its factorization.

28403402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 28403402 is about 5329.4842151938. The cubic root of 28403402 is about 305.1102423303.

Adding to 28403402 its reverse (20430482), we get a palindrome (48833884).

The spelling of 28403402 in words is "twenty-eight million, four hundred three thousand, four hundred two".