428780142889 has 6 divisors (see below), whose sum is σ = 498785064234. Its totient is φ = 367525836720.

The previous prime is 428780142877. The next prime is 428780142913. The reversal of 428780142889 is 988241087824.

It can be written as a sum of positive squares in only one way, i.e., 406161486864 + 22618656025 = 637308^2 + 150395^2 .

It is not a de Polignac number, because 428780142889 - 2⁹ = 428780142377 is a prime.

It is a super-2 number, since 2×428780142889² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428780142839) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4375307532 + ... + 4375307629.

It is an arithmetic number, because the mean of its divisors is an integer number (83130844039).

Almost surely, 2^428780142889 is an apocalyptic number.

428780142889 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

428780142889 is a deficient number, since it is larger than the sum of its proper divisors (70004921345).

428780142889 is an equidigital number, since it uses as much as digits as its factorization.

428780142889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8750615175 (or 8750615168 counting only the distinct ones).

The product of its (nonzero) digits is 16515072, while the sum is 61.

The spelling of 428780142889 in words is "four hundred twenty-eight billion, seven hundred eighty million, one hundred forty-two thousand, eight hundred eighty-nine".