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28644806 = 231462013
BaseRepresentation
bin110110101000…
…1010111000110
31222220022021202
41231101113012
524313113211
62501542502
7465322361
oct155212706
958808252
1028644806
11151952a3
129714a32
135c1c1b8
143b390d8
1527ac53b
hex1b515c6

28644806 has 8 divisors (see below), whose sum is σ = 44353344. Its totient is φ = 13860360.

The previous prime is 28644797. The next prime is 28644817. The reversal of 28644806 is 60844682.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28644806.

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 3 ways as a sum of consecutive naturals, for example, 230945 + ... + 231068.

It is an arithmetic number, because the mean of its divisors is an integer number (5544168).

Almost surely, 228644806 is an apocalyptic number.

28644806 is a deficient number, since it is larger than the sum of its proper divisors (15708538).

28644806 is a wasteful number, since it uses less digits than its factorization.

28644806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 462046.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 28644806 is about 5352.0842669001. The cubic root of 28644806 is about 305.9721947765.

The spelling of 28644806 in words is "twenty-eight million, six hundred forty-four thousand, eight hundred six".

Divisors: 1 2 31 62 462013 924026 14322403 28644806