25634205440 has 72 divisors (see below), whose sum is σ = 61442541888. Its totient is φ = 10246901760.

The previous prime is 25634205397. The next prime is 25634205461. The reversal of 25634205440 is 4450243652.

It is a super-2 number, since 2×25634205440² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 25634205440.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2222729 + ... + 2234231.

Almost surely, 2^25634205440 is an apocalyptic number.

25634205440 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 25634205440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30721270944).

25634205440 is an abundant number, since it is smaller than the sum of its proper divisors (35808336448).

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

25634205440 is a wasteful number, since it uses less digits than its factorization.

25634205440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13265 (or 13251 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

The spelling of 25634205440 in words is "twenty-five billion, six hundred thirty-four million, two hundred five thousand, four hundred forty".