25566380 has 24 divisors (see below), whose sum is σ = 61359648. Its totient is φ = 8765568.

The previous prime is 25566349. The next prime is 25566383. The reversal of 25566380 is 8366552.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 25566380.

It is not an unprimeable number, because it can be changed into a prime (25566383) by changing a digit.

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, 91169 + ... + 91448.

It is an arithmetic number, because the mean of its divisors is an integer number (2556652).

Almost surely, 2^25566380 is an apocalyptic number.

25566380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25566380 is an abundant number, since it is smaller than the sum of its proper divisors (35793268).

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

25566380 is a wasteful number, since it uses less digits than its factorization.

25566380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182633 (or 182631 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 25566380 is about 5056.3207967850. The cubic root of 25566380 is about 294.5934455180.

The spelling of 25566380 in words is "twenty-five million, five hundred sixty-six thousand, three hundred eighty".