25779445240 has 32 divisors (see below), whose sum is σ = 58161833280. Its totient is φ = 10283674752.

The previous prime is 25779445193. The next prime is 25779445247. The reversal of 25779445240 is 4254497752.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (25779445247) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 863367 + ... + 892726.

It is an arithmetic number, because the mean of its divisors is an integer number (1817557290).

Almost surely, 2^25779445240 is an apocalyptic number.

25779445240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25779445240 is an abundant number, since it is smaller than the sum of its proper divisors (32382388040).

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

25779445240 is a wasteful number, since it uses less digits than its factorization.

25779445240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756471 (or 1756467 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 25779445240 in words is "twenty-five billion, seven hundred seventy-nine million, four hundred forty-five thousand, two hundred forty".