25422007440 has 80 divisors (see below), whose sum is σ = 78959874816. Its totient is φ = 6766156800.

The previous prime is 25422007439. The next prime is 25422007441. The reversal of 25422007440 is 4470022452.

It is an interprime number because it is at equal distance from previous prime (25422007439) and next prime (25422007441).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 25422007398 and 25422007407.

It is not an unprimeable number, because it can be changed into a prime (25422007441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23385 + ... + 226695.

Almost surely, 2^25422007440 is an apocalyptic number.

25422007440 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 25422007440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39479937408).

25422007440 is an abundant number, since it is smaller than the sum of its proper divisors (53537867376).

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

25422007440 is a wasteful number, since it uses less digits than its factorization.

25422007440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203848 (or 203842 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 30.

Adding to 25422007440 its reverse (4470022452), we get a palindrome (29892029892).

The spelling of 25422007440 in words is "twenty-five billion, four hundred twenty-two million, seven thousand, four hundred forty".