25688977 has 2 divisors, whose sum is σ = 25688978. Its totient is φ = 25688976.

The previous prime is 25688933. The next prime is 25688981. The reversal of 25688977 is 77988652.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25010001 + 678976 = 5001^2 + 824^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25688977 is a prime.

It is not a weakly prime, because it can be changed into another prime (25688477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12844488 + 12844489.

It is an arithmetic number, because the mean of its divisors is an integer number (12844489).

Almost surely, 2^25688977 is an apocalyptic number.

It is an amenable number.

25688977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25688977 is an equidigital number, since it uses as much as digits as its factorization.

25688977 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 52.

The square root of 25688977 is about 5068.4294411583. The cubic root of 25688977 is about 295.0635772193.

The spelling of 25688977 in words is "twenty-five million, six hundred eighty-eight thousand, nine hundred seventy-seven".