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2561840 = 245311033
BaseRepresentation
bin1001110001011100110000
311211011011222
421301130300
51123434330
6130524212
730526631
oct11613460
94734158
102561840
11149a826
12a36668
136b90a8
144a9888
153590e5
hex271730

2561840 has 40 divisors (see below), whose sum is σ = 6154368. Its totient is φ = 990720.

The previous prime is 2561833. The next prime is 2561857. The reversal of 2561840 is 481652.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1964 + ... + 2996.

22561840 is an apocalyptic number.

2561840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2561840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3077184).

2561840 is an abundant number, since it is smaller than the sum of its proper divisors (3592528).

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

2561840 is a wasteful number, since it uses less digits than its factorization.

2561840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1077 (or 1071 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 2561840 is about 1600.5748967168. The cubic root of 2561840 is about 136.8308424240.

The spelling of 2561840 in words is "two million, five hundred sixty-one thousand, eight hundred forty".

Divisors: 1 2 4 5 8 10 16 20 31 40 62 80 124 155 248 310 496 620 1033 1240 2066 2480 4132 5165 8264 10330 16528 20660 32023 41320 64046 82640 128092 160115 256184 320230 512368 640460 1280920 2561840