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128290 = 2512829
BaseRepresentation
bin11111010100100010
320111222111
4133110202
513101130
62425534
71043011
oct372442
9214874
10128290
1188428
12622aa
1346516
1434a78
152802a
hex1f522

128290 has 8 divisors (see below), whose sum is σ = 230940. Its totient is φ = 51312.

The previous prime is 128287. The next prime is 128291. The reversal of 128290 is 92821.

It can be written as a sum of positive squares in 2 ways, for example, as 127449 + 841 = 357^2 + 29^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6405 + ... + 6424.

2128290 is an apocalyptic number.

128290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128290 is a deficient number, since it is larger than the sum of its proper divisors (102650).

128290 is a wasteful number, since it uses less digits than its factorization.

128290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12836.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 128290 is about 358.1759344233. The cubic root of 128290 is about 50.4348734037.

The spelling of 128290 in words is "one hundred twenty-eight thousand, two hundred ninety".

Divisors: 1 2 5 10 12829 25658 64145 128290