25287820 has 24 divisors (see below), whose sum is σ = 53437104. Its totient is φ = 10051776.

The previous prime is 25287817. The next prime is 25287851. The reversal of 25287820 is 2878252.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 619 + ... + 7138.

It is an arithmetic number, because the mean of its divisors is an integer number (2226546).

Almost surely, 2^25287820 is an apocalyptic number.

25287820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25287820 is an abundant number, since it is smaller than the sum of its proper divisors (28149284).

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

25287820 is a wasteful number, since it uses less digits than its factorization.

25287820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7929 (or 7927 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 25287820 is about 5028.6996331060. The cubic root of 25287820 is about 293.5196159499.

The spelling of 25287820 in words is "twenty-five million, two hundred eighty-seven thousand, eight hundred twenty".