28433278 has 4 divisors (see below), whose sum is σ = 42649920. Its totient is φ = 14216638.

The previous prime is 28433269. The next prime is 28433287. The reversal of 28433278 is 87233482.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (28433269) and next prime (28433287).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7108318 + ... + 7108321.

It is an arithmetic number, because the mean of its divisors is an integer number (10662480).

Almost surely, 2^28433278 is an apocalyptic number.

28433278 is a deficient number, since it is larger than the sum of its proper divisors (14216642).

28433278 is a wasteful number, since it uses less digits than its factorization.

28433278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14216641.

The product of its digits is 64512, while the sum is 37.

The square root of 28433278 is about 5332.2863764055. The cubic root of 28433278 is about 305.2171811569.

The spelling of 28433278 in words is "twenty-eight million, four hundred thirty-three thousand, two hundred seventy-eight".