25277985 has 12 divisors (see below), whose sum is σ = 43815252. Its totient is φ = 13481568.

The previous prime is 25277971. The next prime is 25278049. The reversal of 25277985 is 58977252.

It is a happy number.

25277985 is nontrivially palindromic in base 8.

It can be written as a sum of positive squares in 2 ways, for example, as 11350161 + 13927824 = 3369^2 + 3732^2 .

It is not a de Polignac number, because 25277985 - 2⁴ = 25277969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 561733 = 25277985 / (2 + 5 + 2 + 7 + 7 + 9 + 8 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 25277985.

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, 280822 + ... + 280911.

It is an arithmetic number, because the mean of its divisors is an integer number (3651271).

Almost surely, 2^25277985 is an apocalyptic number.

It is an amenable number.

25277985 is a deficient number, since it is larger than the sum of its proper divisors (18537267).

25277985 is a wasteful number, since it uses less digits than its factorization.

25277985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561744 (or 561741 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 25277985 is about 5027.7216510065. The cubic root of 25277985 is about 293.4815588966.

It can be divided in two parts, 25277 and 985, that added together give a palindrome (26262).

The spelling of 25277985 in words is "twenty-five million, two hundred seventy-seven thousand, nine hundred eighty-five".