764140066 has 4 divisors (see below), whose sum is σ = 1146210102. Its totient is φ = 382070032.

The previous prime is 764140019. The next prime is 764140067. The reversal of 764140066 is 660041467.

It is a happy number.

764140066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 760160041 + 3980025 = 27571^2 + 1995^2 .

It is not an unprimeable number, because it can be changed into a prime (764140067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191035015 + ... + 191035018.

Almost surely, 2^764140066 is an apocalyptic number.

764140066 is a deficient number, since it is larger than the sum of its proper divisors (382070036).

764140066 is a wasteful number, since it uses less digits than its factorization.

764140066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382070035.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 764140066 is about 27643.0835110702. The cubic root of 764140066 is about 914.2346077251.

The spelling of 764140066 in words is "seven hundred sixty-four million, one hundred forty thousand, sixty-six".