25391723280 has 320 divisors, whose sum is σ = 98565120000. Its totient is φ = 5253212160.

The previous prime is 25391723263. The next prime is 25391723297. The reversal of 25391723280 is 8232719352.

It is an interprime number because it is at equal distance from previous prime (25391723263) and next prime (25391723297).

It is a super-2 number, since 2×25391723280² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4413846 + ... + 4419594.

It is an arithmetic number, because the mean of its divisors is an integer number (308016000).

Almost surely, 2^25391723280 is an apocalyptic number.

25391723280 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 25391723280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49282560000).

25391723280 is an abundant number, since it is smaller than the sum of its proper divisors (73173396720).

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

25391723280 is a wasteful number, since it uses less digits than its factorization.

25391723280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6022 (or 6016 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

It can be divided in two parts, 2539172 and 3280, that added together give a palindrome (2542452).

The spelling of 25391723280 in words is "twenty-five billion, three hundred ninety-one million, seven hundred twenty-three thousand, two hundred eighty".