25531780 has 12 divisors (see below), whose sum is σ = 53616780. Its totient is φ = 10212704.

The previous prime is 25531741. The next prime is 25531783. The reversal of 25531780 is 8713552.

It can be written as a sum of positive squares in 2 ways, for example, as 17040384 + 8491396 = 4128^2 + 2914^2 .

It is not an unprimeable number, because it can be changed into a prime (25531783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 638275 + ... + 638314.

It is an arithmetic number, because the mean of its divisors is an integer number (4468065).

Almost surely, 2^25531780 is an apocalyptic number.

25531780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25531780 is an abundant number, since it is smaller than the sum of its proper divisors (28085000).

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

25531780 is a wasteful number, since it uses less digits than its factorization.

25531780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276598 (or 1276596 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 25531780 is about 5052.8981782735. The cubic root of 25531780 is about 294.4604905091.

The spelling of 25531780 in words is "twenty-five million, five hundred thirty-one thousand, seven hundred eighty".