25780061 has 4 divisors (see below), whose sum is σ = 25794300. Its totient is φ = 25765824.

The previous prime is 25780057. The next prime is 25780063. The reversal of 25780061 is 16008752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18757561 + 7022500 = 4331^2 + 2650^2 .

It is a cyclic number.

It is not a de Polignac number, because 25780061 - 2² = 25780057 is a prime.

It is a super-2 number, since 2×25780061² = 1329223090327442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25780063) 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, 3926 + ... + 8183.

It is an arithmetic number, because the mean of its divisors is an integer number (6448575).

Almost surely, 2^25780061 is an apocalyptic number.

It is an amenable number.

25780061 is a deficient number, since it is larger than the sum of its proper divisors (14239).

25780061 is a wasteful number, since it uses less digits than its factorization.

25780061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14238.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 25780061 is about 5077.4069169213. The cubic root of 25780061 is about 295.4118961311.

The spelling of 25780061 in words is "twenty-five million, seven hundred eighty thousand, sixty-one".