25809834270 has 128 divisors (see below), whose sum is σ = 72645672960. Its totient is φ = 5801431680.

The previous prime is 25809834247. The next prime is 25809834283. The reversal of 25809834270 is 7243890852.

It is a super-2 number, since 2×25809834270² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 250899 + ... + 338481.

It is an arithmetic number, because the mean of its divisors is an integer number (567544320).

Almost surely, 2^25809834270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25809834270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36322836480).

25809834270 is an abundant number, since it is smaller than the sum of its proper divisors (46835838690).

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

25809834270 is a wasteful number, since it uses less digits than its factorization.

25809834270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87670.

The product of its (nonzero) digits is 967680, while the sum is 48.

The spelling of 25809834270 in words is "twenty-five billion, eight hundred nine million, eight hundred thirty-four thousand, two hundred seventy".