25642490 has 8 divisors (see below), whose sum is σ = 46156500. Its totient is φ = 10256992.

The previous prime is 25642489. The next prime is 25642499. The reversal of 25642490 is 9424652.

It can be written as a sum of positive squares in 2 ways, for example, as 25290841 + 351649 = 5029^2 + 593^2 .

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

It is not an unprimeable number, because it can be changed into a prime (25642499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1282115 + ... + 1282134.

Almost surely, 2^25642490 is an apocalyptic number.

25642490 is a deficient number, since it is larger than the sum of its proper divisors (20514010).

25642490 is a wasteful number, since it uses less digits than its factorization.

25642490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2564256.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 25642490 is about 5063.8414272171. The cubic root of 25642490 is about 294.8854865315.

The spelling of 25642490 in words is "twenty-five million, six hundred forty-two thousand, four hundred ninety".