25720266 has 64 divisors (see below), whose sum is σ = 62447616. Its totient is φ = 6955200.

The previous prime is 25720241. The next prime is 25720271. The reversal of 25720266 is 66202752.

It is a super-2 number, since 2×25720266² = 1323064166221512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26115 + ... + 27081.

It is an arithmetic number, because the mean of its divisors is an integer number (975744).

Almost surely, 2^25720266 is an apocalyptic number.

25720266 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 25720266, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31223808).

25720266 is an abundant number, since it is smaller than the sum of its proper divisors (36727350).

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

25720266 is a wasteful number, since it uses less digits than its factorization.

25720266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 25720266 is about 5071.5151582146. The cubic root of 25720266 is about 295.1833237618.

The spelling of 25720266 in words is "twenty-five million, seven hundred twenty thousand, two hundred sixty-six".