28478753 has 4 divisors (see below), whose sum is σ = 28507668. Its totient is φ = 28449840.

The previous prime is 28478743. The next prime is 28478759. The reversal of 28478753 is 35787482.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24880144 + 3598609 = 4988^2 + 1897^2 .

It is a cyclic number.

It is not a de Polignac number, because 28478753 - 2⁸ = 28478497 is a prime.

It is a super-2 number, since 2×28478753² = 1622078744870018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28478759) 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 in 3 ways as a sum of consecutive naturals, for example, 12926 + ... + 14967.

It is an arithmetic number, because the mean of its divisors is an integer number (7126917).

Almost surely, 2^28478753 is an apocalyptic number.

It is an amenable number.

28478753 is a deficient number, since it is larger than the sum of its proper divisors (28915).

28478753 is a wasteful number, since it uses less digits than its factorization.

28478753 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28914.

The product of its digits is 376320, while the sum is 44.

The square root of 28478753 is about 5336.5487911196. The cubic root of 28478753 is about 305.3798116998.

The spelling of 28478753 in words is "twenty-eight million, four hundred seventy-eight thousand, seven hundred fifty-three".