766438377 has 4 divisors (see below), whose sum is σ = 1021917840. Its totient is φ = 510958916.

The previous prime is 766438369. The next prime is 766438423. The reversal of 766438377 is 773834667.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 773834667 = 3 ⋅257944889.

It is a cyclic number.

It is not a de Polignac number, because 766438377 - 2³ = 766438369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (766438357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127739727 + ... + 127739732.

It is an arithmetic number, because the mean of its divisors is an integer number (255479460).

Almost surely, 2^766438377 is an apocalyptic number.

It is an amenable number.

766438377 is a deficient number, since it is larger than the sum of its proper divisors (255479463).

766438377 is a wasteful number, since it uses less digits than its factorization.

766438377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255479462.

The product of its digits is 3556224, while the sum is 51.

The square root of 766438377 is about 27684.6234758575. The cubic root of 766438377 is about 915.1502742226.

The spelling of 766438377 in words is "seven hundred sixty-six million, four hundred thirty-eight thousand, three hundred seventy-seven".