28402438 has 4 divisors (see below), whose sum is σ = 42603660. Its totient is φ = 14201218.

The previous prime is 28402433. The next prime is 28402453. The reversal of 28402438 is 83420482.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7100608 + ... + 7100611.

It is an arithmetic number, because the mean of its divisors is an integer number (10650915).

Almost surely, 2^28402438 is an apocalyptic number.

28402438 is a deficient number, since it is larger than the sum of its proper divisors (14201222).

28402438 is a wasteful number, since it uses less digits than its factorization.

28402438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14201221.

The product of its (nonzero) digits is 12288, while the sum is 31.

The square root of 28402438 is about 5329.3937741548. The cubic root of 28402438 is about 305.1067905184.

The spelling of 28402438 in words is "twenty-eight million, four hundred two thousand, four hundred thirty-eight".