428944139781 has 8 divisors (see below), whose sum is σ = 577588149024. Its totient is φ = 283131445200.

The previous prime is 428944139779. The next prime is 428944139809. The reversal of 428944139781 is 187931449824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 428944139781 - 2¹ = 428944139779 is a prime.

It is a super-2 number, since 2×428944139781² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (428944139081) 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 7 ways as a sum of consecutive naturals, for example, 707828311 + ... + 707828916.

It is an arithmetic number, because the mean of its divisors is an integer number (72198518628).

Almost surely, 2^428944139781 is an apocalyptic number.

It is an amenable number.

428944139781 is a deficient number, since it is larger than the sum of its proper divisors (148644009243).

428944139781 is a wasteful number, since it uses less digits than its factorization.

428944139781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415657331.

The product of its digits is 13934592, while the sum is 60.

The spelling of 428944139781 in words is "four hundred twenty-eight billion, nine hundred forty-four million, one hundred thirty-nine thousand, seven hundred eighty-one".