428791243281 has 4 divisors (see below), whose sum is σ = 571721657712. Its totient is φ = 285860828852.

The previous prime is 428791243273. The next prime is 428791243291. The reversal of 428791243281 is 182342197824.

It is a happy number.

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 not a de Polignac number, because 428791243281 - 2³ = 428791243273 is a prime.

It is a super-2 number, since 2×428791243281² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (428791243291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71465207211 + ... + 71465207216.

It is an arithmetic number, because the mean of its divisors is an integer number (142930414428).

Almost surely, 2^428791243281 is an apocalyptic number.

It is an amenable number.

428791243281 is a deficient number, since it is larger than the sum of its proper divisors (142930414431).

428791243281 is a wasteful number, since it uses less digits than its factorization.

428791243281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142930414430.

The product of its digits is 1548288, while the sum is 51.

The spelling of 428791243281 in words is "four hundred twenty-eight billion, seven hundred ninety-one million, two hundred forty-three thousand, two hundred eighty-one".