128108787467 has 4 divisors (see below), whose sum is σ = 129030433560. Its totient is φ = 127187141376.

The previous prime is 128108787451. The next prime is 128108787473. The reversal of 128108787467 is 764787801821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 764787801821 = 491 ⋅1557612631.

It is a cyclic number.

It is not a de Polignac number, because 128108787467 - 2⁴ = 128108787451 is a prime.

It is a super-2 number, since 2×128108787467² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128108787067) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 460822838 + ... + 460823115.

It is an arithmetic number, because the mean of its divisors is an integer number (32257608390).

Almost surely, 2^128108787467 is an apocalyptic number.

128108787467 is a deficient number, since it is larger than the sum of its proper divisors (921646093).

128108787467 is an equidigital number, since it uses as much as digits as its factorization.

128108787467 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921646092.

The product of its (nonzero) digits is 8429568, while the sum is 59.

The spelling of 128108787467 in words is "one hundred twenty-eight billion, one hundred eight million, seven hundred eighty-seven thousand, four hundred sixty-seven".