25781382 has 32 divisors (see below), whose sum is σ = 62501760. Its totient is φ = 7812360.

The previous prime is 25781317. The next prime is 25781389. The reversal of 25781382 is 28318752.

25781382 is a `hidden beast` number, since 2 + 578 + 1 + 3 + 82 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25781389) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21108 + ... + 22295.

It is an arithmetic number, because the mean of its divisors is an integer number (1953180).

Almost surely, 2^25781382 is an apocalyptic number.

25781382 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

25781382 is an abundant number, since it is smaller than the sum of its proper divisors (36720378).

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

25781382 is a wasteful number, since it uses less digits than its factorization.

25781382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43425 (or 43419 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 25781382 is about 5077.5370013423. The cubic root of 25781382 is about 295.4169417934.

The spelling of 25781382 in words is "twenty-five million, seven hundred eighty-one thousand, three hundred eighty-two".