128438147505 has 16 divisors (see below), whose sum is σ = 205930068480. Its totient is φ = 68357334528.

The previous prime is 128438147501. The next prime is 128438147543. The reversal of 128438147505 is 505741834821.

It is not a de Polignac number, because 128438147505 - 2² = 128438147501 is a prime.

It is a super-2 number, since 2×128438147505² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128438147501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8930752 + ... + 8945121.

It is an arithmetic number, because the mean of its divisors is an integer number (12870629280).

Almost surely, 2^128438147505 is an apocalyptic number.

128438147505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128438147505 is a deficient number, since it is larger than the sum of its proper divisors (77491920975).

128438147505 is a wasteful number, since it uses less digits than its factorization.

128438147505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17876360.

The product of its (nonzero) digits is 1075200, while the sum is 48.

The spelling of 128438147505 in words is "one hundred twenty-eight billion, four hundred thirty-eight million, one hundred forty-seven thousand, five hundred five".