906665780 has 18 divisors (see below), whose sum is σ = 1904280966. Its totient is φ = 362612448.

The previous prime is 906665779. The next prime is 906665801. The reversal of 906665780 is 87566609.

906665780 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 3 ways, for example, as 669567376 + 237098404 = 25876^2 + 15398^2 .

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131294 + ... + 138026.

It is an arithmetic number, because the mean of its divisors is an integer number (105793387).

Almost surely, 2^906665780 is an apocalyptic number.

It is an amenable number.

906665780 is an abundant number, since it is smaller than the sum of its proper divisors (997615186).

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

906665780 is an frugal number, since it uses more digits than its factorization.

906665780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13475 (or 6740 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The square root of 906665780 is about 30110.8913850122. The cubic root of 906665780 is about 967.8671313773.

The spelling of 906665780 in words is "nine hundred six million, six hundred sixty-five thousand, seven hundred eighty".