28945645 has 16 divisors (see below), whose sum is σ = 38715840. Its totient is φ = 20646144.

The previous prime is 28945639. The next prime is 28945649. The reversal of 28945645 is 54654982.

It is a cyclic number.

It is not a de Polignac number, because 28945645 - 2¹⁷ = 28814573 is a prime.

It is a super-3 number, since 3×28945645³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28945649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7347 + ... + 10576.

It is an arithmetic number, because the mean of its divisors is an integer number (2419740).

Almost surely, 2^28945645 is an apocalyptic number.

It is an amenable number.

28945645 is a deficient number, since it is larger than the sum of its proper divisors (9770195).

28945645 is a wasteful number, since it uses less digits than its factorization.

28945645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17964.

The product of its digits is 345600, while the sum is 43.

The square root of 28945645 is about 5380.1157050755. The cubic root of 28945645 is about 307.0396133458.

The spelling of 28945645 in words is "twenty-eight million, nine hundred forty-five thousand, six hundred forty-five".