25665828 has 24 divisors (see below), whose sum is σ = 60117120. Its totient is φ = 8522400.

The previous prime is 25665823. The next prime is 25665839. The reversal of 25665828 is 82856652.

It is a self number, because there is not a number n which added to its sum of digits gives 25665828.

It is not an unprimeable number, because it can be changed into a prime (25665821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 748 + ... + 7203.

It is an arithmetic number, because the mean of its divisors is an integer number (2504880).

Almost surely, 2^25665828 is an apocalyptic number.

It is an amenable number.

25665828 is an abundant number, since it is smaller than the sum of its proper divisors (34451292).

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

25665828 is a wasteful number, since it uses less digits than its factorization.

25665828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8227 (or 8225 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 25665828 is about 5066.1452801908. The cubic root of 25665828 is about 294.9749207828.

It can be divided in two parts, 256658 and 28, that added together give a triangular number (256686 = T₇₁₆).

The spelling of 25665828 in words is "twenty-five million, six hundred sixty-five thousand, eight hundred twenty-eight".