764449405 has 4 divisors (see below), whose sum is σ = 917339292. Its totient is φ = 611559520.

The previous prime is 764449397. The next prime is 764449447. The reversal of 764449405 is 504944467.

764449405 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, and also an emirpimes, since its reverse is a distinct semiprime: 504944467 = 19699 ⋅25633.

It can be written as a sum of positive squares in 2 ways, for example, as 380211001 + 384238404 = 19499^2 + 19602^2 .

It is not a de Polignac number, because 764449405 - 2³ = 764449397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 76444936 + ... + 76444945.

It is an arithmetic number, because the mean of its divisors is an integer number (229334823).

Almost surely, 2^764449405 is an apocalyptic number.

It is an amenable number.

764449405 is a deficient number, since it is larger than the sum of its proper divisors (152889887).

764449405 is a wasteful number, since it uses less digits than its factorization.

764449405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152889886.

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 764449405 is about 27648.6781781697. The cubic root of 764449405 is about 914.3579578273.

It can be divided in two parts, 76444 and 9405, that added together give a square (85849 = 293²).

The spelling of 764449405 in words is "seven hundred sixty-four million, four hundred forty-nine thousand, four hundred five".