66707389 has 4 divisors (see below), whose sum is σ = 76237024. Its totient is φ = 57177756.

The previous prime is 66707359. The next prime is 66707413. The reversal of 66707389 is 98370766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66707389 - 2¹⁷ = 66576317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66707359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4764807 + ... + 4764820.

It is an arithmetic number, because the mean of its divisors is an integer number (19059256).

Almost surely, 2^66707389 is an apocalyptic number.

It is an amenable number.

66707389 is a deficient number, since it is larger than the sum of its proper divisors (9529635).

66707389 is an equidigital number, since it uses as much as digits as its factorization.

66707389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9529634.

The product of its (nonzero) digits is 381024, while the sum is 46.

The square root of 66707389 is about 8167.4591520252. The cubic root of 66707389 is about 405.5626767193.

It can be divided in two parts, 66 and 707389, that added together give a triangular number (707455 = T₁₁₈₉).

The spelling of 66707389 in words is "sixty-six million, seven hundred seven thousand, three hundred eighty-nine".