765820018 has 4 divisors (see below), whose sum is σ = 1148730030. Its totient is φ = 382910008.

The previous prime is 765819997. The next prime is 765820051. The reversal of 765820018 is 810028567.

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., 755535169 + 10284849 = 27487^2 + 3207^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 191455003 + ... + 191455006.

Almost surely, 2^765820018 is an apocalyptic number.

765820018 is a deficient number, since it is larger than the sum of its proper divisors (382910012).

765820018 is a wasteful number, since it uses less digits than its factorization.

765820018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382910011.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 765820018 is about 27673.4533081797. The cubic root of 765820018 is about 914.9040949777.

The spelling of 765820018 in words is "seven hundred sixty-five million, eight hundred twenty thousand, eighteen".