25802556 has 48 divisors (see below), whose sum is σ = 65249184. Its totient is φ = 7888896.

The previous prime is 25802531. The next prime is 25802561. The reversal of 25802556 is 65520852.

It is a super-2 number, since 2×25802556² = 1331543792266272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29680 + ... + 30536.

It is an arithmetic number, because the mean of its divisors is an integer number (1359358).

Almost surely, 2^25802556 is an apocalyptic number.

25802556 is a gapful number since it is divisible by the number (26) 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 25802556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32624592).

25802556 is an abundant number, since it is smaller than the sum of its proper divisors (39446628).

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

25802556 is a wasteful number, since it uses less digits than its factorization.

25802556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1070 (or 1068 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 25802556 is about 5079.6216394531. The cubic root of 25802556 is about 295.4977940233.

The spelling of 25802556 in words is "twenty-five million, eight hundred two thousand, five hundred fifty-six".