766138457 has 4 divisors (see below), whose sum is σ = 875586816. Its totient is φ = 656690100.

The previous prime is 766138447. The next prime is 766138459. The reversal of 766138457 is 754831667.

766138457 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 a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 754831667 = 883 ⋅854849.

It is a cyclic number.

It is not a de Polignac number, because 766138457 - 2¹⁸ = 765876313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (766138459) 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, 54724169 + ... + 54724182.

It is an arithmetic number, because the mean of its divisors is an integer number (218896704).

Almost surely, 2^766138457 is an apocalyptic number.

It is an amenable number.

766138457 is a deficient number, since it is larger than the sum of its proper divisors (109448359).

766138457 is a wasteful number, since it uses less digits than its factorization.

766138457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109448358.

The product of its digits is 846720, while the sum is 47.

The square root of 766138457 is about 27679.2062205548. The cubic root of 766138457 is about 915.0308875078.

The spelling of 766138457 in words is "seven hundred sixty-six million, one hundred thirty-eight thousand, four hundred fifty-seven".