764336381 has 2 divisors, whose sum is σ = 764336382. Its totient is φ = 764336380.

The previous prime is 764336369. The next prime is 764336413. The reversal of 764336381 is 183633467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 522533881 + 241802500 = 22859^2 + 15550^2 .

It is an emirp because it is prime and its reverse (183633467) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 764336381 - 2²² = 760142077 is a prime.

It is a super-2 number, since 2×764336381² = 1168420206640354322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (764336311) 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 as a sum of consecutive naturals, namely, 382168190 + 382168191.

It is an arithmetic number, because the mean of its divisors is an integer number (382168191).

Almost surely, 2^764336381 is an apocalyptic number.

It is an amenable number.

764336381 is a deficient number, since it is larger than the sum of its proper divisors (1).

764336381 is an equidigital number, since it uses as much as digits as its factorization.

764336381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 41.

The square root of 764336381 is about 27646.6341712694. The cubic root of 764336381 is about 914.3128929362.

The spelling of 764336381 in words is "seven hundred sixty-four million, three hundred thirty-six thousand, three hundred eighty-one".