28452638 has 4 divisors (see below), whose sum is σ = 42678960. Its totient is φ = 14226318.

The previous prime is 28452631. The next prime is 28452653. The reversal of 28452638 is 83625482.

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 (28452631) 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 as a sum of consecutive naturals, namely, 7113158 + ... + 7113161.

It is an arithmetic number, because the mean of its divisors is an integer number (10669740).

Almost surely, 2^28452638 is an apocalyptic number.

28452638 is a deficient number, since it is larger than the sum of its proper divisors (14226322).

28452638 is a wasteful number, since it uses less digits than its factorization.

28452638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14226321.

The product of its digits is 92160, while the sum is 38.

The square root of 28452638 is about 5334.1014238576. The cubic root of 28452638 is about 305.2864387829.

The spelling of 28452638 in words is "twenty-eight million, four hundred fifty-two thousand, six hundred thirty-eight".