825171728840 has 32 divisors (see below), whose sum is σ = 1873066810680. Its totient is φ = 327147727872.

The previous prime is 825171728839. The next prime is 825171728869. The reversal of 825171728840 is 48827171528.

It can be written as a sum of positive squares in 4 ways, for example, as 696754139524 + 128417589316 = 834718^2 + 358354^2 .

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, 91275539 + ... + 91284578.

Almost surely, 2^825171728840 is an apocalyptic number.

It is an amenable number.

825171728840 is an abundant number, since it is smaller than the sum of its proper divisors (1047895081840).

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

825171728840 is a wasteful number, since it uses less digits than its factorization.

825171728840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182560241 (or 182560237 counting only the distinct ones).

The product of its (nonzero) digits is 2007040, while the sum is 53.

The spelling of 825171728840 in words is "eight hundred twenty-five billion, one hundred seventy-one million, seven hundred twenty-eight thousand, eight hundred forty".