66390692 has 12 divisors (see below), whose sum is σ = 118088796. Its totient is φ = 32651040.

The previous prime is 66390689. The next prime is 66390703. The reversal of 66390692 is 29609366.

66390692 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 6421156 + 59969536 = 2534^2 + 7744^2 .

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 3 ways as a sum of consecutive naturals, for example, 135803 + ... + 136290.

It is an arithmetic number, because the mean of its divisors is an integer number (9840733).

Almost surely, 2^66390692 is an apocalyptic number.

It is an amenable number.

66390692 is a deficient number, since it is larger than the sum of its proper divisors (51698104).

66390692 is a wasteful number, since it uses less digits than its factorization.

66390692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272158 (or 272156 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 66390692 is about 8148.0483552812. The cubic root of 66390692 is about 404.9198479804.

The spelling of 66390692 in words is "sixty-six million, three hundred ninety thousand, six hundred ninety-two".