128776001 has 4 divisors (see below), whose sum is σ = 129495600. Its totient is φ = 128056404.

The previous prime is 128775991. The next prime is 128776007. The reversal of 128776001 is 100677821.

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, and also an emirpimes, since its reverse is a distinct semiprime: 100677821 = 29 ⋅3471649.

It is a cyclic number.

It is not a de Polignac number, because 128776001 - 2²² = 124581697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128776007) 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, 359531 + ... + 359888.

It is an arithmetic number, because the mean of its divisors is an integer number (32373900).

Almost surely, 2^128776001 is an apocalyptic number.

It is an amenable number.

128776001 is a deficient number, since it is larger than the sum of its proper divisors (719599).

128776001 is an equidigital number, since it uses as much as digits as its factorization.

128776001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719598.

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 128776001 is about 11347.9514010239. The cubic root of 128776001 is about 504.9848062612.

The spelling of 128776001 in words is "one hundred twenty-eight million, seven hundred seventy-six thousand, one".