28361645 has 32 divisors (see below), whose sum is σ = 38997504. Its totient is φ = 19641600.

The previous prime is 28361629. The next prime is 28361651. The reversal of 28361645 is 54616382.

It is not a de Polignac number, because 28361645 - 2⁴ = 28361629 is a prime.

It is a super-3 number, since 3×28361645³ (a number of 23 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91040 + ... + 91350.

It is an arithmetic number, because the mean of its divisors is an integer number (1218672).

Almost surely, 2^28361645 is an apocalyptic number.

It is an amenable number.

28361645 is a deficient number, since it is larger than the sum of its proper divisors (10635859).

28361645 is a wasteful number, since it uses less digits than its factorization.

28361645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413.

The product of its digits is 34560, while the sum is 35.

The square root of 28361645 is about 5325.5652282176. The cubic root of 28361645 is about 304.9606506613.

The spelling of 28361645 in words is "twenty-eight million, three hundred sixty-one thousand, six hundred forty-five".