28240402 has 8 divisors (see below), whose sum is σ = 42620976. Its totient is φ = 14033412.

The previous prime is 28240393. The next prime is 28240423. The reversal of 28240402 is 20404282.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 42988 + ... + 43639.

It is an arithmetic number, because the mean of its divisors is an integer number (5327622).

Almost surely, 2^28240402 is an apocalyptic number.

28240402 is a deficient number, since it is larger than the sum of its proper divisors (14380574).

28240402 is a wasteful number, since it uses less digits than its factorization.

28240402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86792.

The product of its (nonzero) digits is 1024, while the sum is 22.

The square root of 28240402 is about 5314.1699257739. The cubic root of 28240402 is about 304.5254718981.

Adding to 28240402 its reverse (20404282), we get a palindrome (48644684).

The spelling of 28240402 in words is "twenty-eight million, two hundred forty thousand, four hundred two".