28106402 has 8 divisors (see below), whose sum is σ = 43188012. Its totient is φ = 13710400.

The previous prime is 28106399. The next prime is 28106411. The reversal of 28106402 is 20460182.

It can be written as a sum of positive squares in 2 ways, for example, as 24492601 + 3613801 = 4949^2 + 1901^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171299 + ... + 171462.

Almost surely, 2^28106402 is an apocalyptic number.

28106402 is a deficient number, since it is larger than the sum of its proper divisors (15081610).

28106402 is a wasteful number, since it uses less digits than its factorization.

28106402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342804.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 28106402 is about 5301.5471326774. The cubic root of 28106402 is about 304.0430528245.

Adding to 28106402 its reverse (20460182), we get a palindrome (48566584).

The spelling of 28106402 in words is "twenty-eight million, one hundred six thousand, four hundred two".