66690704 has 20 divisors (see below), whose sum is σ = 130495740. Its totient is φ = 33014400.

The previous prime is 66690653. The next prime is 66690713. The reversal of 66690704 is 40709666.

It can be written as a sum of positive squares in 2 ways, for example, as 29724304 + 36966400 = 5452^2 + 6080^2 .

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, 19019 + ... + 22250.

It is an arithmetic number, because the mean of its divisors is an integer number (6524787).

Almost surely, 2^66690704 is an apocalyptic number.

It is an amenable number.

66690704 is a deficient number, since it is larger than the sum of its proper divisors (63805036).

66690704 is a wasteful number, since it uses less digits than its factorization.

66690704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41378 (or 41372 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 38.

The square root of 66690704 is about 8166.4376566530. The cubic root of 66690704 is about 405.5288604879.

The spelling of 66690704 in words is "sixty-six million, six hundred ninety thousand, seven hundred four".