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28687038 = 234781173
BaseRepresentation
bin110110101101…
…1101010111110
31222222110012220
41231123222332
524320441123
62502510210
7465556452
oct155335276
958873186
1028687038
1115213aa6
129735366
135c354a3
143b4a662
1527b9ce3
hex1b5babe

28687038 has 8 divisors (see below), whose sum is σ = 57374088. Its totient is φ = 9562344.

The previous prime is 28687031. The next prime is 28687051. The reversal of 28687038 is 83078682.

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

28687038 is an admirable number.

It is a super-2 number, since 2×286870382 = 1645892298426888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28687031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2390581 + ... + 2390592.

It is an arithmetic number, because the mean of its divisors is an integer number (7171761).

Almost surely, 228687038 is an apocalyptic number.

28687038 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28687038 is a wasteful number, since it uses less digits than its factorization.

28687038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4781178.

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 28687038 is about 5356.0281926069. The cubic root of 28687038 is about 306.1224893019.

The spelling of 28687038 in words is "twenty-eight million, six hundred eighty-seven thousand, thirty-eight".

Divisors: 1 2 3 6 4781173 9562346 14343519 28687038