28539402 has 16 divisors (see below), whose sum is σ = 57399840. Its totient is φ = 9459632.

The previous prime is 28539397. The next prime is 28539409. The reversal of 28539402 is 20493582.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28539409) by changing a digit.

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, 12213 + ... + 14360.

It is an arithmetic number, because the mean of its divisors is an integer number (3587490).

Almost surely, 2^28539402 is an apocalyptic number.

28539402 is an abundant number, since it is smaller than the sum of its proper divisors (28860438).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28539402 is a wasteful number, since it uses less digits than its factorization.

28539402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26757.

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 28539402 is about 5342.2281868149. The cubic root of 28539402 is about 305.5964392580.

The spelling of 28539402 in words is "twenty-eight million, five hundred thirty-nine thousand, four hundred two".