827665780 has 12 divisors (see below), whose sum is σ = 1738098180. Its totient is φ = 331066304.

The previous prime is 827665721. The next prime is 827665799. The reversal of 827665780 is 87566728.

827665780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 581677924 + 245987856 = 24118^2 + 15684^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20691625 + ... + 20691664.

It is an arithmetic number, because the mean of its divisors is an integer number (144841515).

Almost surely, 2^827665780 is an apocalyptic number.

It is an amenable number.

827665780 is an abundant number, since it is smaller than the sum of its proper divisors (910432400).

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

827665780 is a wasteful number, since it uses less digits than its factorization.

827665780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41383298 (or 41383296 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 49.

The square root of 827665780 is about 28769.1810797596. The cubic root of 827665780 is about 938.8978254242.

The spelling of 827665780 in words is "eight hundred twenty-seven million, six hundred sixty-five thousand, seven hundred eighty".