28864513 has 4 divisors (see below), whose sum is σ = 28974528. Its totient is φ = 28754500.

The previous prime is 28864499. The next prime is 28864519. The reversal of 28864513 is 31546882.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28864513 - 2⁹ = 28864001 is a prime.

It is a super-2 number, since 2×28864513² = 1666320221454338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28864519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54613 + ... + 55138.

It is an arithmetic number, because the mean of its divisors is an integer number (7243632).

Almost surely, 2^28864513 is an apocalyptic number.

It is an amenable number.

28864513 is a deficient number, since it is larger than the sum of its proper divisors (110015).

28864513 is a wasteful number, since it uses less digits than its factorization.

28864513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110014.

The product of its digits is 46080, while the sum is 37.

The square root of 28864513 is about 5372.5704276445. The cubic root of 28864513 is about 306.7524769056.

The spelling of 28864513 in words is "twenty-eight million, eight hundred sixty-four thousand, five hundred thirteen".