2505780 has 36 divisors (see below), whose sum is σ = 7601412. Its totient is φ = 668160.

The previous prime is 2505779. The next prime is 2505791. The reversal of 2505780 is 875052.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1192464 + 1313316 = 1092^2 + 1146^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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, 6781 + ... + 7140.

2^2505780 is an apocalyptic number.

2505780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2505780 is an abundant number, since it is smaller than the sum of its proper divisors (5095632).

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

2505780 is a wasteful number, since it uses less digits than its factorization.

2505780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13936 (or 13931 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 27.

The square root of 2505780 is about 1582.9655713249. The cubic root of 2505780 is about 135.8253958836.

The spelling of 2505780 in words is "two million, five hundred five thousand, seven hundred eighty".