66756490 has 8 divisors (see below), whose sum is σ = 120161700. Its totient is φ = 26702592.

The previous prime is 66756479. The next prime is 66756491. The reversal of 66756490 is 9465766.

It can be written as a sum of positive squares in 2 ways, for example, as 54597321 + 12159169 = 7389^2 + 3487^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (66756491) 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 3 ways as a sum of consecutive naturals, for example, 3337815 + ... + 3337834.

Almost surely, 2^66756490 is an apocalyptic number.

66756490 is a deficient number, since it is larger than the sum of its proper divisors (53405210).

66756490 is a wasteful number, since it uses less digits than its factorization.

66756490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6675656.

The product of its (nonzero) digits is 272160, while the sum is 43.

The square root of 66756490 is about 8170.4644910801. The cubic root of 66756490 is about 405.6621591975.

The spelling of 66756490 in words is "sixty-six million, seven hundred fifty-six thousand, four hundred ninety".