25816240 has 40 divisors (see below), whose sum is σ = 60272928. Its totient is φ = 10283520.

The previous prime is 25816223. The next prime is 25816253. The reversal of 25816240 is 4261852.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 25816199 and 25816208.

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, 24525 + ... + 25555.

Almost surely, 2^25816240 is an apocalyptic number.

25816240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25816240 is an abundant number, since it is smaller than the sum of its proper divisors (34456688).

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

25816240 is a wasteful number, since it uses less digits than its factorization.

25816240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1357 (or 1351 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 25816240 is about 5080.9684116318. The cubic root of 25816240 is about 295.5500224046.

The spelling of 25816240 in words is "twenty-five million, eight hundred sixteen thousand, two hundred forty".