Search a number
28600321 = 31229761
BaseRepresentation
bin110110100011…
…0100000000001
31222211001021011
41231012200001
524310202241
62501000521
7465045601
oct155064001
958731234
1028600321
1115164932
1296b3141
135c04b89
143b26c01
15279e281
hex1b46801

28600321 has 6 divisors (see below), whose sum is σ = 29553666. Its totient is φ = 27676800.

The previous prime is 28600303. The next prime is 28600331. The reversal of 28600321 is 12300682.

It can be written as a sum of positive squares in only one way, i.e., 19927296 + 8673025 = 4464^2 + 2945^2 .

It is a de Polignac number, because none of the positive numbers 2k-28600321 is a prime.

It is a super-3 number, since 3×286003213 (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28600292 and 28600301.

It is not an unprimeable number, because it can be changed into a prime (28600331) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13920 + ... + 15841.

It is an arithmetic number, because the mean of its divisors is an integer number (4925611).

It is a 30-hyperperfect number.

Almost surely, 228600321 is an apocalyptic number.

It is an amenable number.

28600321 is a deficient number, since it is larger than the sum of its proper divisors (953345).

28600321 is an equidigital number, since it uses as much as digits as its factorization.

28600321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29823 (or 29792 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 28600321 is about 5347.9267945625. The cubic root of 28600321 is about 305.8137224732.

The spelling of 28600321 in words is "twenty-eight million, six hundred thousand, three hundred twenty-one".

Divisors: 1 31 961 29761 922591 28600321