28019465 has 8 divisors (see below), whose sum is σ = 33721800. Its totient is φ = 22349952.

The previous prime is 28019461. The next prime is 28019477. The reversal of 28019465 is 56491082.

It can be written as a sum of positive squares in 4 ways, for example, as 4700224 + 23319241 = 2168^2 + 4829^2 .

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 28019465 - 2² = 28019461 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28019461) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6284 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (4215225).

Almost surely, 2^28019465 is an apocalyptic number.

It is an amenable number.

28019465 is a deficient number, since it is larger than the sum of its proper divisors (5702335).

28019465 is a wasteful number, since it uses less digits than its factorization.

28019465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16411.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 28019465 is about 5293.3415722018. The cubic root of 28019465 is about 303.7292466077.

The spelling of 28019465 in words is "twenty-eight million, nineteen thousand, four hundred sixty-five".