25638834 has 32 divisors (see below), whose sum is σ = 55480320. Its totient is φ = 7852032.

The previous prime is 25638827. The next prime is 25638857. The reversal of 25638834 is 43883652.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 25638792 and 25638801.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19407 + ... + 20685.

It is an arithmetic number, because the mean of its divisors is an integer number (1733760).

Almost surely, 2^25638834 is an apocalyptic number.

25638834 is an abundant number, since it is smaller than the sum of its proper divisors (29841486).

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

25638834 is a wasteful number, since it uses less digits than its factorization.

25638834 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1554.

The product of its digits is 138240, while the sum is 39.

The square root of 25638834 is about 5063.4804235822. The cubic root of 25638834 is about 294.8714713483.

The spelling of 25638834 in words is "twenty-five million, six hundred thirty-eight thousand, eight hundred thirty-four".