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25656640 = 26580177
BaseRepresentation
bin110000111011…
…1110101000000
31210021111021221
41201313311000
523032003030
62313524424
7431035462
oct141676500
953244257
1025656640
1113534239
128713714
135414059
14359c132
1523bbe7a
hex1877d40

25656640 has 28 divisors (see below), whose sum is σ = 61095636. Its totient is φ = 10262528.

The previous prime is 25656637. The next prime is 25656647. The reversal of 25656640 is 4665652.

It can be written as a sum of positive squares in 2 ways, for example, as 9784384 + 15872256 = 3128^2 + 3984^2 .

It is a junction number, because it is equal to n+sod(n) for n = 25656596 and 25656605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25656647) 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, 39769 + ... + 40408.

It is an arithmetic number, because the mean of its divisors is an integer number (2181987).

Almost surely, 225656640 is an apocalyptic number.

25656640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25656640 is an abundant number, since it is smaller than the sum of its proper divisors (35438996).

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

25656640 is an equidigital number, since it uses as much as digits as its factorization.

25656640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80194 (or 80184 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 25656640 is about 5065.2383951794. The cubic root of 25656640 is about 294.9397176450.

The spelling of 25656640 in words is "twenty-five million, six hundred fifty-six thousand, six hundred forty".

Divisors: 1 2 4 5 8 10 16 20 32 40 64 80 160 320 80177 160354 320708 400885 641416 801770 1282832 1603540 2565664 3207080 5131328 6414160 12828320 25656640