25870861824 has 80 divisors (see below), whose sum is σ = 69190825968. Its totient is φ = 8589934592.

The previous prime is 25870861823. The next prime is 25870861831. The reversal of 25870861824 is 42816807852.

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25870861823) by changing a digit.

In principle, a polygon with 25870861824 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361984 + ... + 427520.

Almost surely, 2^25870861824 is an apocalyptic number.

25870861824 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 25870861824, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34595412984).

25870861824 is an abundant number, since it is smaller than the sum of its proper divisors (43319964144).

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

25870861824 is an equidigital number, since it uses as much as digits as its factorization.

25870861824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65815 (or 65799 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 51.

The spelling of 25870861824 in words is "twenty-five billion, eight hundred seventy million, eight hundred sixty-one thousand, eight hundred twenty-four".