66968590 has 16 divisors (see below), whose sum is σ = 129816288. Its totient is φ = 24726816.

The previous prime is 66968579. The next prime is 66968591. The reversal of 66968590 is 9586966.

It is a super-3 number, since 3×66968590³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66968591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257442 + ... + 257701.

It is an arithmetic number, because the mean of its divisors is an integer number (8113518).

Almost surely, 2^66968590 is an apocalyptic number.

66968590 is a deficient number, since it is larger than the sum of its proper divisors (62847698).

66968590 is a wasteful number, since it uses less digits than its factorization.

66968590 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515163.

The product of its (nonzero) digits is 699840, while the sum is 49.

The square root of 66968590 is about 8183.4338758250. The cubic root of 66968590 is about 406.0913308571.

The spelling of 66968590 in words is "sixty-six million, nine hundred sixty-eight thousand, five hundred ninety".