66705782 has 32 divisors (see below), whose sum is σ = 118298880. Its totient is φ = 27810720.

The previous prime is 66705781. The next prime is 66705809. The reversal of 66705782 is 28750766.

It is a happy number.

It is a super-2 number, since 2×66705782² = 8899322704463048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66705781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50543 + ... + 51845.

It is an arithmetic number, because the mean of its divisors is an integer number (3696840).

Almost surely, 2^66705782 is an apocalyptic number.

66705782 is a deficient number, since it is larger than the sum of its proper divisors (51593098).

66705782 is a wasteful number, since it uses less digits than its factorization.

66705782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1508.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 66705782 is about 8167.3607732241. The cubic root of 66705782 is about 405.5594199864.

The spelling of 66705782 in words is "sixty-six million, seven hundred five thousand, seven hundred eighty-two".