25774640 has 80 divisors (see below), whose sum is σ = 65233920. Its totient is φ = 9434880.

The previous prime is 25774603. The next prime is 25774657. The reversal of 25774640 is 4647752.

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 25774640.

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, 46847 + ... + 47393.

It is an arithmetic number, because the mean of its divisors is an integer number (815424).

Almost surely, 2^25774640 is an apocalyptic number.

25774640 is a gapful number since it is divisible by the number (20) 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 25774640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32616960).

25774640 is an abundant number, since it is smaller than the sum of its proper divisors (39459280).

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

25774640 is a wasteful number, since it uses less digits than its factorization.

25774640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 604 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 35.

The square root of 25774640 is about 5076.8730533666. The cubic root of 25774640 is about 295.3911883943.

The spelling of 25774640 in words is "twenty-five million, seven hundred seventy-four thousand, six hundred forty".