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25297920 = 21034561
BaseRepresentation
bin110000010000…
…0010000000000
31202121021020000
41200200100000
522434013140
62302120000
7425012604
oct140402000
952537200
1025297920
111330977a
128580000
1353199ab
143507504
15234aa30
hex1820400

25297920 has 220 divisors, whose sum is σ = 92139564. Its totient is φ = 6635520.

The previous prime is 25297879. The next prime is 25297957. The reversal of 25297920 is 2979252.

It can be written as a sum of positive squares in 2 ways, for example, as 4064256 + 21233664 = 2016^2 + 4608^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 414690 + ... + 414750.

Almost surely, 225297920 is an apocalyptic number.

25297920 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 25297920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46069782).

25297920 is an abundant number, since it is smaller than the sum of its proper divisors (66841644).

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

25297920 is an equidigital number, since it uses as much as digits as its factorization.

25297920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 25297920 is about 5029.7037686130. The cubic root of 25297920 is about 293.5586881663.

The spelling of 25297920 in words is "twenty-five million, two hundred ninety-seven thousand, nine hundred twenty".