28704375 has 90 divisors (see below), whose sum is σ = 61486568. Its totient is φ = 13122000.

The previous prime is 28704371. The next prime is 28704397. The reversal of 28704375 is 57340782.

28704375 is a `hidden beast` number, since 287 + 0 + 4 + 375 = 666.

It is not a de Polignac number, because 28704375 - 2² = 28704371 is a prime.

It is a super-2 number, since 2×28704375² = 1647882288281250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28704371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 89 ways as a sum of consecutive naturals, for example, 4100622 + ... + 4100628.

Almost surely, 2^28704375 is an apocalyptic number.

28704375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28704375 is an abundant number, since it is smaller than the sum of its proper divisors (32782193).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28704375 is an frugal number, since it uses more digits than its factorization.

28704375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51 (or 15 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The square root of 28704375 is about 5357.6464049058. The cubic root of 28704375 is about 306.1841452179.

The spelling of 28704375 in words is "twenty-eight million, seven hundred four thousand, three hundred seventy-five".