765428457 has 4 divisors (see below), whose sum is σ = 1020571280. Its totient is φ = 510285636.

The previous prime is 765428449. The next prime is 765428483. The reversal of 765428457 is 754824567.

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.

It is not a de Polignac number, because 765428457 - 2³ = 765428449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (765428557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127571407 + ... + 127571412.

It is an arithmetic number, because the mean of its divisors is an integer number (255142820).

Almost surely, 2^765428457 is an apocalyptic number.

It is an amenable number.

765428457 is a deficient number, since it is larger than the sum of its proper divisors (255142823).

765428457 is a wasteful number, since it uses less digits than its factorization.

765428457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255142822.

The product of its digits is 1881600, while the sum is 48.

The square root of 765428457 is about 27666.3777354391. The cubic root of 765428457 is about 914.7481393453.

The spelling of 765428457 in words is "seven hundred sixty-five million, four hundred twenty-eight thousand, four hundred fifty-seven".