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261604 = 2279343
BaseRepresentation
bin111111110111100100
3111021212001
4333313210
531332404
65335044
72136460
oct776744
9437761
10261604
11169602
12107484
13920c5
146b4a0
15527a4
hex3fde4

261604 has 12 divisors (see below), whose sum is σ = 523264. Its totient is φ = 112104.

The previous prime is 261601. The next prime is 261619. The reversal of 261604 is 406162.

Adding to 261604 its reverse (406162), we get a palindrome (667766).

261604 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (261601) by changing a digit.

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, 4644 + ... + 4699.

2261604 is an apocalyptic number.

It is an amenable number.

261604 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.

261604 is a wasteful number, since it uses less digits than its factorization.

261604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354 (or 9352 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 261604 is about 511.4723843963. The cubic root of 261604 is about 63.9560244781.

The spelling of 261604 in words is "two hundred sixty-one thousand, six hundred four".

Divisors: 1 2 4 7 14 28 9343 18686 37372 65401 130802 261604