28064509 has 8 divisors (see below), whose sum is σ = 31328352. Its totient is φ = 24919440.

The previous prime is 28064483. The next prime is 28064521. The reversal of 28064509 is 90546082.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28064509 is a prime.

It is a super-2 number, since 2×28064509² = 1575233330822162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28064599) 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, 29194 + ... + 30139.

It is an arithmetic number, because the mean of its divisors is an integer number (3916044).

Almost surely, 2^28064509 is an apocalyptic number.

It is an amenable number.

28064509 is a deficient number, since it is larger than the sum of its proper divisors (3263843).

28064509 is a wasteful number, since it uses less digits than its factorization.

28064509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59387.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 28064509 is about 5297.5946428544. The cubic root of 28064509 is about 303.8919175159.

The spelling of 28064509 in words is "twenty-eight million, sixty-four thousand, five hundred nine".