25481780 has 12 divisors (see below), whose sum is σ = 53511780. Its totient is φ = 10192704.

The previous prime is 25481779. The next prime is 25481791. The reversal of 25481780 is 8718452.

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 6853924 = 4316^2 + 2618^2 .

It is a super-2 number, since 2×25481780² = 1298642223936800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25481780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637025 + ... + 637064.

It is an arithmetic number, because the mean of its divisors is an integer number (4459315).

Almost surely, 2^25481780 is an apocalyptic number.

25481780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25481780 is an abundant number, since it is smaller than the sum of its proper divisors (28030000).

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

25481780 is a wasteful number, since it uses less digits than its factorization.

25481780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274098 (or 1274096 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 25481780 is about 5047.9480979899. The cubic root of 25481780 is about 294.2681466157.

The spelling of 25481780 in words is "twenty-five million, four hundred eighty-one thousand, seven hundred eighty".