28456693 has 4 divisors (see below), whose sum is σ = 28504800. Its totient is φ = 28408588.

The previous prime is 28456651. The next prime is 28456717. The reversal of 28456693 is 39665482.

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, and also an emirpimes, since its reverse is a distinct semiprime: 39665482 = 2 ⋅19832741.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28456693 is a prime.

It is a super-3 number, since 3×28456693³ (a number of 23 digits) contains 333 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 (28456613) 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, 23155 + ... + 24352.

It is an arithmetic number, because the mean of its divisors is an integer number (7126200).

Almost surely, 2^28456693 is an apocalyptic number.

It is an amenable number.

28456693 is a deficient number, since it is larger than the sum of its proper divisors (48107).

28456693 is an equidigital number, since it uses as much as digits as its factorization.

28456693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48106.

The product of its digits is 311040, while the sum is 43.

The square root of 28456693 is about 5334.4815118247. The cubic root of 28456693 is about 305.3009409848.

The spelling of 28456693 in words is "twenty-eight million, four hundred fifty-six thousand, six hundred ninety-three".