775638793 has 2 divisors, whose sum is σ = 775638794. Its totient is φ = 775638792.

The previous prime is 775638769. The next prime is 775638803. The reversal of 775638793 is 397836577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 766348489 + 9290304 = 27683^2 + 3048^2 .

It is an emirp because it is prime and its reverse (397836577) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 775638793 - 2⁵ = 775638761 is a prime.

It is not a weakly prime, because it can be changed into another prime (775638713) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387819396 + 387819397.

It is an arithmetic number, because the mean of its divisors is an integer number (387819397).

Almost surely, 2^775638793 is an apocalyptic number.

It is an amenable number.

775638793 is a deficient number, since it is larger than the sum of its proper divisors (1).

775638793 is an equidigital number, since it uses as much as digits as its factorization.

775638793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6667920, while the sum is 55.

The square root of 775638793 is about 27850.2925119288. The cubic root of 775638793 is about 918.7975757183.

The spelling of 775638793 in words is "seven hundred seventy-five million, six hundred thirty-eight thousand, seven hundred ninety-three".