28458665 has 8 divisors (see below), whose sum is σ = 34181568. Its totient is φ = 22746160.

The previous prime is 28458653. The next prime is 28458667. The reversal of 28458665 is 56685482.

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

It is not a de Polignac number, because 28458665 - 2⁴ = 28458649 is a prime.

It is a super-2 number, since 2×28458665² = 1619791227164450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28458667) 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, 6044 + ... + 9666.

It is an arithmetic number, because the mean of its divisors is an integer number (4272696).

Almost surely, 2^28458665 is an apocalyptic number.

It is an amenable number.

28458665 is a deficient number, since it is larger than the sum of its proper divisors (5722903).

28458665 is a wasteful number, since it uses less digits than its factorization.

28458665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5199.

The product of its digits is 460800, while the sum is 44.

The square root of 28458665 is about 5334.6663438307. Note that the first 3 decimals coincide. The cubic root of 28458665 is about 305.3079930990.

The spelling of 28458665 in words is "twenty-eight million, four hundred fifty-eight thousand, six hundred sixty-five".