66829731 has 12 divisors (see below), whose sum is σ = 89792136. Its totient is φ = 44212800.

The previous prime is 66829699. The next prime is 66829751. The reversal of 66829731 is 13792866.

It is a happy number.

It is not a de Polignac number, because 66829731 - 2⁵ = 66829699 is a prime.

It is a super-2 number, since 2×66829731² = 8932425891064722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66829751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67915 + ... + 68891.

It is an arithmetic number, because the mean of its divisors is an integer number (7482678).

Almost surely, 2^66829731 is an apocalyptic number.

66829731 is a deficient number, since it is larger than the sum of its proper divisors (22962405).

66829731 is an equidigital number, since it uses as much as digits as its factorization.

66829731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1282 (or 1131 counting only the distinct ones).

The product of its digits is 108864, while the sum is 42.

The square root of 66829731 is about 8174.9453209181. The cubic root of 66829731 is about 405.8104605991.

The spelling of 66829731 in words is "sixty-six million, eight hundred twenty-nine thousand, seven hundred thirty-one".