25840395620 has 48 divisors (see below), whose sum is σ = 58457569968. Its totient is φ = 9538045440.

The previous prime is 25840395593. The next prime is 25840395667. The reversal of 25840395620 is 2659304852.

It can be written as a sum of positive squares in 8 ways, for example, as 5655942436 + 20184453184 = 75206^2 + 142072^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 910850 + ... + 938790.

It is an arithmetic number, because the mean of its divisors is an integer number (1217866041).

Almost surely, 2^25840395620 is an apocalyptic number.

25840395620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

25840395620 is an abundant number, since it is smaller than the sum of its proper divisors (32617174348).

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

25840395620 is a wasteful number, since it uses less digits than its factorization.

25840395620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31520 (or 31518 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 44.

The spelling of 25840395620 in words is "twenty-five billion, eight hundred forty million, three hundred ninety-five thousand, six hundred twenty".