28493517 has 8 divisors (see below), whose sum is σ = 40913824. Its totient is φ = 17534448.

The previous prime is 28493503. The next prime is 28493533. The reversal of 28493517 is 71539482.

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

It is not a de Polignac number, because 28493517 - 2⁴ = 28493501 is a prime.

It is a super-2 number, since 2×28493517² = 1623761022058578, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 730603 = 28493517 / (2 + 8 + 4 + 9 + 3 + 5 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28493117) 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, 365263 + ... + 365340.

It is an arithmetic number, because the mean of its divisors is an integer number (5114228).

Almost surely, 2^28493517 is an apocalyptic number.

It is an amenable number.

28493517 is a deficient number, since it is larger than the sum of its proper divisors (12420307).

28493517 is a wasteful number, since it uses less digits than its factorization.

28493517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 730619.

The product of its digits is 60480, while the sum is 39.

The square root of 28493517 is about 5337.9319029002. The cubic root of 28493517 is about 305.4325744108.

The spelling of 28493517 in words is "twenty-eight million, four hundred ninety-three thousand, five hundred seventeen".