25714640 has 80 divisors (see below), whose sum is σ = 69852672. Its totient is φ = 8620032.

The previous prime is 25714613. The next prime is 25714643. The reversal of 25714640 is 4641752.

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

It is a super-2 number, since 2×25714640² = 1322485420659200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25714643) 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, 25832 + ... + 26808.

Almost surely, 2^25714640 is an apocalyptic number.

25714640 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 25714640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34926336).

25714640 is an abundant number, since it is smaller than the sum of its proper divisors (44138032).

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

25714640 is a wasteful number, since it uses less digits than its factorization.

25714640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044 (or 1038 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 25714640 is about 5070.9604612933. The cubic root of 25714640 is about 295.1617995873.

The spelling of 25714640 in words is "twenty-five million, seven hundred fourteen thousand, six hundred forty".