25640342 has 24 divisors (see below), whose sum is σ = 47600496. Its totient is φ = 10142496.

The previous prime is 25640339. The next prime is 25640353. The reversal of 25640342 is 24304652.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3053 + ... + 7784.

It is an arithmetic number, because the mean of its divisors is an integer number (1983354).

Almost surely, 2^25640342 is an apocalyptic number.

25640342 is a deficient number, since it is larger than the sum of its proper divisors (21960154).

25640342 is a wasteful number, since it uses less digits than its factorization.

25640342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10872 (or 10859 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 25640342 is about 5063.6293308259. The cubic root of 25640342 is about 294.8772523895.

Adding to 25640342 its reverse (24304652), we get a palindrome (49944994).

The spelling of 25640342 in words is "twenty-five million, six hundred forty thousand, three hundred forty-two".