25781976 has 80 divisors (see below), whose sum is σ = 78800040. Its totient is φ = 7810560.

The previous prime is 25781963. The next prime is 25781999. The reversal of 25781976 is 67918752.

25781976 is a `hidden beast` number, since 2 + 578 + 1 + 9 + 76 = 666.

It is a congruent number.

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, 5320 + ... + 8936.

Almost surely, 2^25781976 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 25781976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39400020).

25781976 is an abundant number, since it is smaller than the sum of its proper divisors (53018064).

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

25781976 is a wasteful number, since it uses less digits than its factorization.

25781976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3646 (or 3633 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 25781976 is about 5077.5954939321. The cubic root of 25781976 is about 295.4192105665.

It can be divided in two parts, 2578 and 1976, that added together give a palindrome (4554).

The spelling of 25781976 in words is "twenty-five million, seven hundred eighty-one thousand, nine hundred seventy-six".