25709388 has 12 divisors (see below), whose sum is σ = 59988600. Its totient is φ = 8569792.

The previous prime is 25709381. The next prime is 25709401. The reversal of 25709388 is 88390752.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (25709381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1071213 + ... + 1071236.

It is an arithmetic number, because the mean of its divisors is an integer number (4999050).

Almost surely, 2^25709388 is an apocalyptic number.

It is an amenable number.

25709388 is an abundant number, since it is smaller than the sum of its proper divisors (34279212).

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

25709388 is a wasteful number, since it uses less digits than its factorization.

25709388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142456 (or 2142454 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 25709388 is about 5070.4425842327. The cubic root of 25709388 is about 295.1417034434.

The spelling of 25709388 in words is "twenty-five million, seven hundred nine thousand, three hundred eighty-eight".