25557780 has 48 divisors (see below), whose sum is σ = 72745344. Its totient is φ = 6702720.

The previous prime is 25557757. The next prime is 25557803. The reversal of 25557780 is 8775552.

It is an interprime number because it is at equal distance from previous prime (25557757) and next prime (25557803).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 169 + ... + 7151.

It is an arithmetic number, because the mean of its divisors is an integer number (1515528).

Almost surely, 2^25557780 is an apocalyptic number.

25557780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25557780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36372672).

25557780 is an abundant number, since it is smaller than the sum of its proper divisors (47187564).

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

25557780 is a wasteful number, since it uses less digits than its factorization.

25557780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7056 (or 7054 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 39.

The square root of 25557780 is about 5055.4703045315. The cubic root of 25557780 is about 294.5604101051.

The spelling of 25557780 in words is "twenty-five million, five hundred fifty-seven thousand, seven hundred eighty".