25349640 has 32 divisors (see below), whose sum is σ = 76049280. Its totient is φ = 6759872.

The previous prime is 25349633. The next prime is 25349677. The reversal of 25349640 is 4694352.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105504 + ... + 105743.

It is an arithmetic number, because the mean of its divisors is an integer number (2376540).

Almost surely, 2^25349640 is an apocalyptic number.

25349640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25349640 is an abundant number, since it is smaller than the sum of its proper divisors (50699640).

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

25349640 is a wasteful number, since it uses less digits than its factorization.

25349640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211261 (or 211257 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 25349640 is about 5034.8425993272. The cubic root of 25349640 is about 293.7586060554.

The spelling of 25349640 in words is "twenty-five million, three hundred forty-nine thousand, six hundred forty".