25487977 has 2 divisors, whose sum is σ = 25487978. Its totient is φ = 25487976.

The previous prime is 25487971. The next prime is 25488031. The reversal of 25487977 is 77978452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25290841 + 197136 = 5029^2 + 444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-25487977 is a prime.

It is a plaindrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 25487977.

It is not a weakly prime, because it can be changed into another prime (25487971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12743988 + 12743989.

It is an arithmetic number, because the mean of its divisors is an integer number (12743989).

Almost surely, 2^25487977 is an apocalyptic number.

It is an amenable number.

25487977 is a deficient number, since it is larger than the sum of its proper divisors (1).

25487977 is an equidigital number, since it uses as much as digits as its factorization.

25487977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 49.

The square root of 25487977 is about 5048.5618744351. The cubic root of 25487977 is about 294.2919993698.

The spelling of 25487977 in words is "twenty-five million, four hundred eighty-seven thousand, nine hundred seventy-seven".