764755993 has 2 divisors, whose sum is σ = 764755994. Its totient is φ = 764755992.

The previous prime is 764755991. The next prime is 764756009. The reversal of 764755993 is 399557467.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 559464409 + 205291584 = 23653^2 + 14328^2 .

It is a cyclic number.

It is not a de Polignac number, because 764755993 - 2¹ = 764755991 is a prime.

Together with 764755991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (764755991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 382377996 + 382377997.

It is an arithmetic number, because the mean of its divisors is an integer number (382377997).

Almost surely, 2^764755993 is an apocalyptic number.

It is an amenable number.

764755993 is a deficient number, since it is larger than the sum of its proper divisors (1).

764755993 is an equidigital number, since it uses as much as digits as its factorization.

764755993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7144200, while the sum is 55.

The square root of 764755993 is about 27654.2219742303. The cubic root of 764755993 is about 914.4801781285.

The spelling of 764755993 in words is "seven hundred sixty-four million, seven hundred fifty-five thousand, nine hundred ninety-three".