25621956 has 72 divisors (see below), whose sum is σ = 69713280. Its totient is φ = 7909056.

The previous prime is 25621927. The next prime is 25621961. The reversal of 25621956 is 65912652.

25621956 is a `hidden beast` number, since 2 + 562 + 1 + 95 + 6 = 666.

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

It is a self number, because there is not a number n which added to its sum of digits gives 25621956.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31750 + ... + 32546.

It is an arithmetic number, because the mean of its divisors is an integer number (968240).

Almost surely, 2^25621956 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25621956, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34856640).

25621956 is an abundant number, since it is smaller than the sum of its proper divisors (44091324).

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

25621956 is a wasteful number, since it uses less digits than its factorization.

25621956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 873 (or 868 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 25621956 is about 5061.8135090104. The cubic root of 25621956 is about 294.8067526853.

The spelling of 25621956 in words is "twenty-five million, six hundred twenty-one thousand, nine hundred fifty-six".