25540642 has 4 divisors (see below), whose sum is σ = 38310966. Its totient is φ = 12770320.

The previous prime is 25540607. The next prime is 25540651. The reversal of 25540642 is 24604552.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14984641 + 10556001 = 3871^2 + 3249^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 25540642.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6385159 + ... + 6385162.

Almost surely, 2^25540642 is an apocalyptic number.

25540642 is a deficient number, since it is larger than the sum of its proper divisors (12770324).

25540642 is a wasteful number, since it uses less digits than its factorization.

25540642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12770323.

The product of its (nonzero) digits is 9600, while the sum is 28.

The square root of 25540642 is about 5053.7750246722. The cubic root of 25540642 is about 294.4945553361.

The spelling of 25540642 in words is "twenty-five million, five hundred forty thousand, six hundred forty-two".