25640838 has 24 divisors (see below), whose sum is σ = 56078568. Its totient is φ = 8466432.

The previous prime is 25640831. The next prime is 25640863. The reversal of 25640838 is 83804652.

25640838 is a `hidden beast` number, since 2 + 5 + 640 + 8 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25640831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4731 + ... + 8582.

It is an arithmetic number, because the mean of its divisors is an integer number (2336607).

Almost surely, 2^25640838 is an apocalyptic number.

25640838 is an abundant number, since it is smaller than the sum of its proper divisors (30437730).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

25640838 is a wasteful number, since it uses less digits than its factorization.

25640838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13428 (or 13425 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 25640838 is about 5063.6783073177. The cubic root of 25640838 is about 294.8791537964.

The spelling of 25640838 in words is "twenty-five million, six hundred forty thousand, eight hundred thirty-eight".