25804980 has 120 divisors (see below), whose sum is σ = 85804488. Its totient is φ = 6469632.

The previous prime is 25804969. The next prime is 25804981. The reversal of 25804980 is 8940852.

It can be written as a sum of positive squares in 4 ways, for example, as 944784 + 24860196 = 972^2 + 4986^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25804981) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27072 + ... + 28008.

Almost surely, 2^25804980 is an apocalyptic number.

25804980 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 25804980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42902244).

25804980 is an abundant number, since it is smaller than the sum of its proper divisors (59999508).

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

25804980 is a wasteful number, since it uses less digits than its factorization.

25804980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 25804980 is about 5079.8602342978. The cubic root of 25804980 is about 295.5070471663.

The spelling of 25804980 in words is "twenty-five million, eight hundred four thousand, nine hundred eighty".