28032402 has 16 divisors (see below), whose sum is σ = 56580480. Its totient is φ = 9258192.

The previous prime is 28032359. The next prime is 28032409. The reversal of 28032402 is 20423082.

It is not an unprimeable number, because it can be changed into a prime (28032409) 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, 20778 + ... + 22085.

It is an arithmetic number, because the mean of its divisors is an integer number (3536280).

Almost surely, 2^28032402 is an apocalyptic number.

28032402 is an abundant number, since it is smaller than the sum of its proper divisors (28548078).

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

28032402 is a wasteful number, since it uses less digits than its factorization.

28032402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42977.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 28032402 is about 5294.5634380938. The cubic root of 28032402 is about 303.7759848386.

Adding to 28032402 its reverse (20423082), we get a palindrome (48455484).

The spelling of 28032402 in words is "twenty-eight million, thirty-two thousand, four hundred two".