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28245989 = 196124371
BaseRepresentation
bin110101110111…
…1111111100101
31222011001012202
41223233333211
524212332424
62445224245
7462041552
oct153577745
958131182
1028245989
1114a426a2
129562085
135b0c805
143a73a29
15272e2ae
hex1aeffe5

28245989 has 8 divisors (see below), whose sum is σ = 30221280. Its totient is φ = 26319600.

The previous prime is 28245983. The next prime is 28246003. The reversal of 28245989 is 98954282.

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

It is a cyclic number.

It is not a de Polignac number, because 28245989 - 212 = 28241893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28245983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11027 + ... + 13344.

It is an arithmetic number, because the mean of its divisors is an integer number (3777660).

Almost surely, 228245989 is an apocalyptic number.

It is an amenable number.

28245989 is a deficient number, since it is larger than the sum of its proper divisors (1975291).

28245989 is a wasteful number, since it uses less digits than its factorization.

28245989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24451.

The product of its digits is 414720, while the sum is 47.

The square root of 28245989 is about 5314.6955698328. The cubic root of 28245989 is about 304.5455527221.

The spelling of 28245989 in words is "twenty-eight million, two hundred forty-five thousand, nine hundred eighty-nine".

Divisors: 1 19 61 1159 24371 463049 1486631 28245989