25487666 has 8 divisors (see below), whose sum is σ = 38308140. Its totient is φ = 12718288.

The previous prime is 25487639. The next prime is 25487681. The reversal of 25487666 is 66678452.

It can be written as a sum of positive squares in 2 ways, for example, as 24790441 + 697225 = 4979^2 + 835^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×25487666² = 1299242236255112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11501 + ... + 13536.

Almost surely, 2^25487666 is an apocalyptic number.

25487666 is a deficient number, since it is larger than the sum of its proper divisors (12820474).

25487666 is a wasteful number, since it uses less digits than its factorization.

25487666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25548.

The product of its digits is 483840, while the sum is 44.

The square root of 25487666 is about 5048.5310734906. The cubic root of 25487666 is about 294.2908023978.

The spelling of 25487666 in words is "twenty-five million, four hundred eighty-seven thousand, six hundred sixty-six".