25780900 has 36 divisors (see below), whose sum is σ = 56510272. Its totient is φ = 10208160.

The previous prime is 25780889. The next prime is 25780919. The reversal of 25780900 is 908752.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9049 + ... + 11551.

Almost surely, 2^25780900 is an apocalyptic number.

25780900 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 25780900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28255136).

25780900 is an abundant number, since it is smaller than the sum of its proper divisors (30729372).

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

25780900 is a wasteful number, since it uses less digits than its factorization.

25780900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2620 (or 2613 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 31.

The square root of 25780900 is about 5077.4895371630. The cubic root of 25780900 is about 295.4151007768.

The spelling of 25780900 in words is "twenty-five million, seven hundred eighty thousand, nine hundred".