428564726977 has 4 divisors (see below), whose sum is σ = 447197976000. Its totient is φ = 409931477956.

The previous prime is 428564726963. The next prime is 428564726987. The reversal of 428564726977 is 779627465824.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-428564726977 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428564726987) 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, 9316624477 + ... + 9316624522.

It is an arithmetic number, because the mean of its divisors is an integer number (111799494000).

Almost surely, 2^428564726977 is an apocalyptic number.

It is an amenable number.

428564726977 is a deficient number, since it is larger than the sum of its proper divisors (18633249023).

428564726977 is a wasteful number, since it uses less digits than its factorization.

428564726977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18633249022.

The product of its digits is 284497920, while the sum is 67.

The spelling of 428564726977 in words is "four hundred twenty-eight billion, five hundred sixty-four million, seven hundred twenty-six thousand, nine hundred seventy-seven".