28470689 has 8 divisors (see below), whose sum is σ = 30933672. Its totient is φ = 26046720.

The previous prime is 28470653. The next prime is 28470697. The reversal of 28470689 is 98607482.

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 28462225 = 92^2 + 5335^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28470689 - 2⁸ = 28470433 is a prime.

It is a super-3 number, since 3×28470689³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28470289) 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 in 7 ways as a sum of consecutive naturals, for example, 8222 + ... + 11159.

It is an arithmetic number, because the mean of its divisors is an integer number (3866709).

Almost surely, 2^28470689 is an apocalyptic number.

It is an amenable number.

28470689 is a deficient number, since it is larger than the sum of its proper divisors (2462983).

28470689 is a wasteful number, since it uses less digits than its factorization.

28470689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19507.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 28470689 is about 5335.7931931438. The cubic root of 28470689 is about 305.3509853525.

The spelling of 28470689 in words is "twenty-eight million, four hundred seventy thousand, six hundred eighty-nine".