25831980 has 48 divisors (see below), whose sum is σ = 80367840. Its totient is φ = 6888384.

The previous prime is 25831979. The next prime is 25831987. The reversal of 25831980 is 8913852.

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

It is not an unprimeable number, because it can be changed into a prime (25831987) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23379 + ... + 24458.

It is an arithmetic number, because the mean of its divisors is an integer number (1674330).

Almost surely, 2^25831980 is an apocalyptic number.

25831980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25831980 is an abundant number, since it is smaller than the sum of its proper divisors (54535860).

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

25831980 is a wasteful number, since it uses less digits than its factorization.

25831980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47855 (or 47847 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 25831980 is about 5082.5170929373. The cubic root of 25831980 is about 295.6100752015.

The spelling of 25831980 in words is "twenty-five million, eight hundred thirty-one thousand, nine hundred eighty".