25807440340 has 96 divisors (see below), whose sum is σ = 60694018560. Its totient is φ = 9138355200.

The previous prime is 25807440331. The next prime is 25807440343. The reversal of 25807440340 is 4304470852.

It is a self number, because there is not a number n which added to its sum of digits gives 25807440340.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25807440343) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1258570 + ... + 1278910.

It is an arithmetic number, because the mean of its divisors is an integer number (632229360).

Almost surely, 2^25807440340 is an apocalyptic number.

25807440340 is a gapful number since it is divisible by the number (20) 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 25807440340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30347009280).

25807440340 is an abundant number, since it is smaller than the sum of its proper divisors (34886578220).

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

25807440340 is a wasteful number, since it uses less digits than its factorization.

25807440340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20513 (or 20511 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 37.

The spelling of 25807440340 in words is "twenty-five billion, eight hundred seven million, four hundred forty thousand, three hundred forty".