25487989490 has 8 divisors (see below), whose sum is σ = 45878381100. Its totient is φ = 10195195792.

The previous prime is 25487989459. The next prime is 25487989507. The reversal of 25487989490 is 9498978452.

It can be written as a sum of positive squares in 2 ways, for example, as 21376486849 + 4111502641 = 146207^2 + 64121^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1274399465 + ... + 1274399484.

Almost surely, 2^25487989490 is an apocalyptic number.

25487989490 is a deficient number, since it is larger than the sum of its proper divisors (20390391610).

25487989490 is a wasteful number, since it uses less digits than its factorization.

25487989490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2548798956.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 25487989490 in words is "twenty-five billion, four hundred eighty-seven million, nine hundred eighty-nine thousand, four hundred ninety".