25642487 has 8 divisors (see below), whose sum is σ = 28506240. Its totient is φ = 22906080.

The previous prime is 25642483. The next prime is 25642489. The reversal of 25642487 is 78424652.

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

It is a cyclic number.

It is not a de Polignac number, because 25642487 - 2² = 25642483 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 25642487.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25642483) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31412 + ... + 32217.

It is an arithmetic number, because the mean of its divisors is an integer number (3563280).

Almost surely, 2^25642487 is an apocalyptic number.

25642487 is a deficient number, since it is larger than the sum of its proper divisors (2863753).

25642487 is a wasteful number, since it uses less digits than its factorization.

25642487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63673.

The product of its digits is 107520, while the sum is 38.

The square root of 25642487 is about 5063.8411309993. The cubic root of 25642487 is about 294.8854750316.

The spelling of 25642487 in words is "twenty-five million, six hundred forty-two thousand, four hundred eighty-seven".